diff --git a/src/blocks/scratch3_music.js b/src/blocks/scratch3_music.js
new file mode 100644
index 000000000..f70fd48ae
--- /dev/null
+++ b/src/blocks/scratch3_music.js
@@ -0,0 +1,371 @@
+const ArgumentType = require('../extension-support/argument-type');
+const BlockType = require('../extension-support/block-type');
+const Clone = require('../util/clone');
+const Cast = require('../util/cast');
+const MathUtil = require('../util/math-util');
+
+/**
+ * An array of drum names, used in the play drum block.
+ * @type {string[]}
+ */
+const drumNames = [
+    'Snare Drum',
+    'Bass Drum',
+    'Side Stick',
+    'Crash Cymbal',
+    'Open Hi-Hat',
+    'Closed Hi-Hat',
+    'Tambourine',
+    'Hand Clap',
+    'Claves',
+    'Wood Block',
+    'Cowbell',
+    'Triangle',
+    'Bongo',
+    'Conga',
+    'Cabasa',
+    'Guiro',
+    'Vibraslap',
+    'Open Cuica'
+];
+
+/**
+ * An array of instrument names, used in the set instrument block.
+ * @type {string[]}
+ */
+const instrumentNames = [
+    'Piano',
+    'Electric Piano',
+    'Organ',
+    'Guitar',
+    'Electric Guitar',
+    'Bass',
+    'Pizzicato',
+    'Cello',
+    'Trombone',
+    'Clarinet',
+    'Saxophone',
+    'Flute',
+    'Wooden Flute',
+    'Bassoon',
+    'Choir',
+    'Vibraphone',
+    'Music Box',
+    'Steel Drum',
+    'Marimba',
+    'Synth Lead',
+    'Synth Pad'
+];
+
+/**
+ * Class for the music-related blocks in Scratch 3.0
+ * @param {Runtime} runtime - the runtime instantiating this block package.
+ * @constructor
+ */
+class Scratch3MusicBlocks {
+    constructor (runtime) {
+        /**
+         * The runtime instantiating this block package.
+         * @type {Runtime}
+         */
+        this.runtime = runtime;
+
+        this.drumMenu = this._buildMenu(drumNames);
+        this.instrumentMenu = this._buildMenu(instrumentNames);
+    }
+
+    /**
+     * Build a menu using an array of strings.
+     * Used for creating the drum and instrument menus.
+     * @param  {string[]} names - An array of names.
+     * @return {array} - An array of objects with text and value properties, for constructing a block menu.
+     * @private
+     */
+    _buildMenu (names) {
+        const menu = [];
+        for (let i = 0; i < names.length; i++) {
+            const entry = {};
+            const num = i + 1; // Menu numbers are one-indexed
+            entry.text = `(${num}) ${names[i]}`;
+            entry.value = String(num);
+            menu.push(entry);
+        }
+        return menu;
+    }
+
+    /**
+     * The key to load & store a target's music-related state.
+     * @type {string}
+     */
+    static get STATE_KEY () {
+        return 'Scratch.music';
+    }
+
+    /**
+     * The default music-related state, to be used when a target has no existing music state.
+     * @type {MusicState}
+     */
+    static get DEFAULT_MUSIC_STATE () {
+        return {
+            currentInstrument: 0
+        };
+    }
+
+    /**
+     * The minimum and maximum MIDI note numbers, for clamping the input to play note.
+     * @type {{min: number, max: number}}
+     */
+    static get MIDI_NOTE_RANGE () {
+        return {min: 36, max: 96}; // C2 to C7
+    }
+
+    /**
+     * The minimum and maximum beat values, for clamping the duration of play note, play drum and rest.
+     * 100 beats at the default tempo of 60bpm is 100 seconds.
+     * @type {{min: number, max: number}}
+     */
+    static get BEAT_RANGE () {
+        return {min: 0, max: 100};
+    }
+
+    /** The minimum and maximum tempo values, in bpm.
+     * @type {{min: number, max: number}}
+     */
+    static get TEMPO_RANGE () {
+        return {min: 20, max: 500};
+    }
+
+    /**
+     * @param {Target} target - collect music state for this target.
+     * @returns {MusicState} the mutable music state associated with that target. This will be created if necessary.
+     * @private
+     */
+    _getMusicState (target) {
+        let musicState = target.getCustomState(Scratch3MusicBlocks.STATE_KEY);
+        if (!musicState) {
+            musicState = Clone.simple(Scratch3MusicBlocks.DEFAULT_MUSIC_STATE);
+            target.setCustomState(Scratch3MusicBlocks.STATE_KEY, musicState);
+        }
+        return musicState;
+    }
+
+    /**
+     * @returns {object} metadata for this extension and its blocks.
+     */
+    getInfo () {
+        return {
+            id: 'music',
+            name: 'Music',
+            blocks: [
+                {
+                    opcode: 'playDrumForBeats',
+                    blockType: BlockType.COMMAND,
+                    text: 'play drum [DRUM] for [BEATS] beats',
+                    arguments: {
+                        DRUM: {
+                            type: ArgumentType.NUMBER,
+                            menu: 'drums',
+                            defaultValue: 1
+                        },
+                        BEATS: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 0.25
+                        }
+                    }
+                },
+                {
+                    opcode: 'restForBeats',
+                    blockType: BlockType.COMMAND,
+                    text: 'rest for [BEATS] beats',
+                    arguments: {
+                        BEATS: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 0.25
+                        }
+                    }
+                },
+                {
+                    opcode: 'playNoteForBeats',
+                    blockType: BlockType.COMMAND,
+                    text: 'play note [NOTE] for [BEATS] beats',
+                    arguments: {
+                        NOTE: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 60
+                        },
+                        BEATS: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 0.25
+                        }
+                    }
+                },
+                {
+                    opcode: 'setInstrument',
+                    blockType: BlockType.COMMAND,
+                    text: 'set instrument to [INSTRUMENT]',
+                    arguments: {
+                        INSTRUMENT: {
+                            type: ArgumentType.NUMBER,
+                            menu: 'instruments',
+                            defaultValue: 1
+                        }
+                    }
+                },
+                {
+                    opcode: 'setTempo',
+                    blockType: BlockType.COMMAND,
+                    text: 'set tempo to [TEMPO]',
+                    arguments: {
+                        TEMPO: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 60
+                        }
+                    }
+                },
+                {
+                    opcode: 'changeTempo',
+                    blockType: BlockType.COMMAND,
+                    text: 'change tempo by [TEMPO]',
+                    arguments: {
+                        TEMPO: {
+                            type: ArgumentType.NUMBER,
+                            defaultValue: 20
+                        }
+                    }
+                },
+                {
+                    opcode: 'getTempo',
+                    text: 'tempo',
+                    blockType: BlockType.REPORTER
+                }
+            ],
+            menus: {
+                drums: this.drumMenu,
+                instruments: this.instrumentMenu
+            }
+        };
+    }
+
+    /**
+     * Play a drum sound for some number of beats.
+     * @param {object} args - the block arguments.
+     * @param {object} util - utility object provided by the runtime.
+     * @property {int} DRUM - the number of the drum to play.
+     * @property {number} BEATS - the duration in beats of the drum sound.
+     * @return {Promise} - a promise which will resolve at the end of the duration.
+     */
+    playDrumForBeats (args, util) {
+        let drum = Cast.toNumber(args.DRUM);
+        drum -= 1; // drums are one-indexed
+        if (typeof this.runtime.audioEngine === 'undefined') return;
+        drum = MathUtil.wrapClamp(drum, 0, this.runtime.audioEngine.numDrums - 1);
+        let beats = Cast.toNumber(args.BEATS);
+        beats = this._clampBeats(beats);
+        if (util.target.audioPlayer === null) return;
+        return util.target.audioPlayer.playDrumForBeats(drum, beats);
+    }
+
+    /**
+     * Rest for some number of beats.
+     * @param {object} args - the block arguments.
+     * @param {object} util - utility object provided by the runtime.
+     * @property {number} BEATS - the duration in beats of the rest.
+     * @return {Promise} - a promise which will resolve at the end of the duration.
+     */
+    restForBeats (args) {
+        let beats = Cast.toNumber(args.BEATS);
+        beats = this._clampBeats(beats);
+        if (typeof this.runtime.audioEngine === 'undefined') return;
+        return this.runtime.audioEngine.waitForBeats(beats);
+    }
+
+    /**
+     * Play a note using the current musical instrument for some number of beats.
+     * @param {object} args - the block arguments.
+     * @param {object} util - utility object provided by the runtime.
+     * @property {number} NOTE - the pitch of the note to play, interpreted as a MIDI note number.
+     * @property {number} BEATS - the duration in beats of the note.
+     * @return {Promise} - a promise which will resolve at the end of the duration.
+     */
+    playNoteForBeats (args, util) {
+        let note = Cast.toNumber(args.NOTE);
+        note = MathUtil.clamp(note, Scratch3MusicBlocks.MIDI_NOTE_RANGE.min, Scratch3MusicBlocks.MIDI_NOTE_RANGE.max);
+        let beats = Cast.toNumber(args.BEATS);
+        beats = this._clampBeats(beats);
+        const musicState = this._getMusicState(util.target);
+        const inst = musicState.currentInstrument;
+        if (typeof this.runtime.audioEngine === 'undefined') return;
+        return this.runtime.audioEngine.playNoteForBeatsWithInstAndVol(note, beats, inst, 100);
+    }
+
+    /**
+     * Select an instrument for playing notes.
+     * @param {object} args - the block arguments.
+     * @param {object} util - utility object provided by the runtime.
+     * @property {int} INSTRUMENT - the number of the instrument to select.
+     * @return {Promise} - a promise which will resolve once the instrument has loaded.
+     */
+    setInstrument (args, util) {
+        const musicState = this._getMusicState(util.target);
+        let instNum = Cast.toNumber(args.INSTRUMENT);
+        instNum -= 1; // instruments are one-indexed
+        if (typeof this.runtime.audioEngine === 'undefined') return;
+        instNum = MathUtil.wrapClamp(instNum, 0, this.runtime.audioEngine.numInstruments - 1);
+        musicState.currentInstrument = instNum;
+        return this.runtime.audioEngine.instrumentPlayer.loadInstrument(musicState.currentInstrument);
+    }
+
+    /**
+     * Clamp a duration in beats to the allowed min and max duration.
+     * @param  {number} beats - a duration in beats.
+     * @return {number} - the clamped duration.
+     * @private
+     */
+    _clampBeats (beats) {
+        return MathUtil.clamp(beats, Scratch3MusicBlocks.BEAT_RANGE.min, Scratch3MusicBlocks.BEAT_RANGE.max);
+    }
+
+    /**
+     * Set the current tempo to a new value.
+     * @param {object} args - the block arguments.
+     * @property {number} TEMPO - the tempo, in beats per minute.
+     */
+    setTempo (args) {
+        const tempo = Cast.toNumber(args.TEMPO);
+        this._updateTempo(tempo);
+    }
+
+    /**
+     * Change the current tempo by some amount.
+     * @param {object} args - the block arguments.
+     * @property {number} TEMPO - the amount to change the tempo, in beats per minute.
+     */
+    changeTempo (args) {
+        const change = Cast.toNumber(args.TEMPO);
+        if (typeof this.runtime.audioEngine === 'undefined') return;
+        const tempo = change + this.runtime.audioEngine.currentTempo;
+        this._updateTempo(tempo);
+    }
+
+    /**
+     * Update the current tempo, clamping it to the min and max allowable range.
+     * @param {number} tempo - the tempo to set, in beats per minute.
+     * @private
+     */
+    _updateTempo (tempo) {
+        tempo = MathUtil.clamp(tempo, Scratch3MusicBlocks.TEMPO_RANGE.min, Scratch3MusicBlocks.TEMPO_RANGE.max);
+        if (typeof this.runtime.audioEngine === 'undefined') return;
+        this.runtime.audioEngine.setTempo(tempo);
+    }
+
+    /**
+     * Get the current tempo.
+     * @return {number} - the current tempo, in beats per minute.
+     */
+    getTempo () {
+        if (typeof this.runtime.audioEngine === 'undefined') return;
+        return this.runtime.audioEngine.currentTempo;
+    }
+}
+
+module.exports = Scratch3MusicBlocks;
diff --git a/src/blocks/scratch3_sound.js b/src/blocks/scratch3_sound.js
index 1f7745742..6f5fed972 100644
--- a/src/blocks/scratch3_sound.js
+++ b/src/blocks/scratch3_sound.js
@@ -91,10 +91,6 @@ class Scratch3SoundBlocks {
             sound_play: this.playSound,
             sound_playuntildone: this.playSoundAndWait,
             sound_stopallsounds: this.stopAllSounds,
-            sound_playnoteforbeats: this.playNoteForBeats,
-            sound_playdrumforbeats: this.playDrumForBeats,
-            sound_restforbeats: this.restForBeats,
-            sound_setinstrumentto: this.setInstrument,
             sound_seteffectto: this.setEffect,
             sound_changeeffectby: this.changeEffect,
             sound_cleareffects: this.clearEffects,
@@ -103,10 +99,7 @@ class Scratch3SoundBlocks {
             sound_effects_menu: this.effectsMenu,
             sound_setvolumeto: this.setVolume,
             sound_changevolumeby: this.changeVolume,
-            sound_volume: this.getVolume,
-            sound_settempotobpm: this.setTempo,
-            sound_changetempoby: this.changeTempo,
-            sound_tempo: this.getTempo
+            sound_volume: this.getVolume
         };
     }
 
@@ -167,50 +160,6 @@ class Scratch3SoundBlocks {
         util.target.audioPlayer.stopAllSounds();
     }
 
-    playNoteForBeats (args, util) {
-        let note = Cast.toNumber(args.NOTE);
-        note = MathUtil.clamp(note, Scratch3SoundBlocks.MIDI_NOTE_RANGE.min, Scratch3SoundBlocks.MIDI_NOTE_RANGE.max);
-        let beats = Cast.toNumber(args.BEATS);
-        beats = this._clampBeats(beats);
-        const soundState = this._getSoundState(util.target);
-        const inst = soundState.currentInstrument;
-        const vol = soundState.volume;
-        if (typeof this.runtime.audioEngine === 'undefined') return;
-        return this.runtime.audioEngine.playNoteForBeatsWithInstAndVol(note, beats, inst, vol);
-    }
-
-    playDrumForBeats (args, util) {
-        let drum = Cast.toNumber(args.DRUM);
-        drum -= 1; // drums are one-indexed
-        if (typeof this.runtime.audioEngine === 'undefined') return;
-        drum = MathUtil.wrapClamp(drum, 0, this.runtime.audioEngine.numDrums - 1);
-        let beats = Cast.toNumber(args.BEATS);
-        beats = this._clampBeats(beats);
-        if (util.target.audioPlayer === null) return;
-        return util.target.audioPlayer.playDrumForBeats(drum, beats);
-    }
-
-    restForBeats (args) {
-        let beats = Cast.toNumber(args.BEATS);
-        beats = this._clampBeats(beats);
-        if (typeof this.runtime.audioEngine === 'undefined') return;
-        return this.runtime.audioEngine.waitForBeats(beats);
-    }
-
-    _clampBeats (beats) {
-        return MathUtil.clamp(beats, Scratch3SoundBlocks.BEAT_RANGE.min, Scratch3SoundBlocks.BEAT_RANGE.max);
-    }
-
-    setInstrument (args, util) {
-        const soundState = this._getSoundState(util.target);
-        let instNum = Cast.toNumber(args.INSTRUMENT);
-        instNum -= 1; // instruments are one-indexed
-        if (typeof this.runtime.audioEngine === 'undefined') return;
-        instNum = MathUtil.wrapClamp(instNum, 0, this.runtime.audioEngine.numInstruments - 1);
-        soundState.currentInstrument = instNum;
-        return this.runtime.audioEngine.instrumentPlayer.loadInstrument(soundState.currentInstrument);
-    }
-
     setEffect (args, util) {
         this._updateEffect(args, util, false);
     }
@@ -273,29 +222,6 @@ class Scratch3SoundBlocks {
         return soundState.volume;
     }
 
-    setTempo (args) {
-        const tempo = Cast.toNumber(args.TEMPO);
-        this._updateTempo(tempo);
-    }
-
-    changeTempo (args) {
-        const change = Cast.toNumber(args.TEMPO);
-        if (typeof this.runtime.audioEngine === 'undefined') return;
-        const tempo = change + this.runtime.audioEngine.currentTempo;
-        this._updateTempo(tempo);
-    }
-
-    _updateTempo (tempo) {
-        tempo = MathUtil.clamp(tempo, Scratch3SoundBlocks.TEMPO_RANGE.min, Scratch3SoundBlocks.TEMPO_RANGE.max);
-        if (typeof this.runtime.audioEngine === 'undefined') return;
-        this.runtime.audioEngine.setTempo(tempo);
-    }
-
-    getTempo () {
-        if (typeof this.runtime.audioEngine === 'undefined') return;
-        return this.runtime.audioEngine.currentTempo;
-    }
-
     soundsMenu (args) {
         return args.SOUND_MENU;
     }
diff --git a/src/extension-support/extension-manager.js b/src/extension-support/extension-manager.js
index 5cfa2b4a3..938e791dc 100644
--- a/src/extension-support/extension-manager.js
+++ b/src/extension-support/extension-manager.js
@@ -8,9 +8,11 @@ const BlockType = require('./block-type');
 // TODO: change extension spec so that library info, including extension ID, can be collected through static methods
 const Scratch3PenBlocks = require('../blocks/scratch3_pen');
 const Scratch3WeDo2Blocks = require('../blocks/scratch3_wedo2');
+const Scratch3MusicBlocks = require('../blocks/scratch3_music');
 const builtinExtensions = {
     pen: Scratch3PenBlocks,
-    wedo2: Scratch3WeDo2Blocks
+    wedo2: Scratch3WeDo2Blocks,
+    music: Scratch3MusicBlocks
 };
 
 /**
diff --git a/src/serialization/sb2_specmap.js b/src/serialization/sb2_specmap.js
index cf5be1c89..b511d59c8 100644
--- a/src/serialization/sb2_specmap.js
+++ b/src/serialization/sb2_specmap.js
@@ -418,7 +418,7 @@ const specMap = {
         ]
     },
     'playDrum': {
-        opcode: 'sound_playdrumforbeats',
+        opcode: 'music.playDrumForBeats',
         argMap: [
             {
                 type: 'input',
@@ -433,7 +433,7 @@ const specMap = {
         ]
     },
     'rest:elapsed:from:': {
-        opcode: 'sound_restforbeats',
+        opcode: 'music.restForBeats',
         argMap: [
             {
                 type: 'input',
@@ -443,7 +443,7 @@ const specMap = {
         ]
     },
     'noteOn:duration:elapsed:from:': {
-        opcode: 'sound_playnoteforbeats',
+        opcode: 'music.playNoteForBeats',
         argMap: [
             {
                 type: 'input',
@@ -458,7 +458,7 @@ const specMap = {
         ]
     },
     'instrument:': {
-        opcode: 'sound_setinstrumentto',
+        opcode: 'music.setInstrument',
         argMap: [
             {
                 type: 'input',
@@ -493,7 +493,7 @@ const specMap = {
         ]
     },
     'changeTempoBy:': {
-        opcode: 'sound_changetempoby',
+        opcode: 'music.changeTempo',
         argMap: [
             {
                 type: 'input',
@@ -503,7 +503,7 @@ const specMap = {
         ]
     },
     'setTempoTo:': {
-        opcode: 'sound_settempotobpm',
+        opcode: 'music.setTempo',
         argMap: [
             {
                 type: 'input',
@@ -513,7 +513,7 @@ const specMap = {
         ]
     },
     'tempo': {
-        opcode: 'sound_tempo',
+        opcode: 'music.getTempo',
         argMap: [
         ]
     },
diff --git a/test/integration/sound.js b/test/integration/sound.js
index 50100d70f..1c5f20dcd 100644
--- a/test/integration/sound.js
+++ b/test/integration/sound.js
@@ -1,12 +1,17 @@
+const Worker = require('tiny-worker');
 const path = require('path');
 const test = require('tap').test;
 const makeTestStorage = require('../fixtures/make-test-storage');
 const extract = require('../fixtures/extract');
 const VirtualMachine = require('../../src/index');
+const dispatch = require('../../src/dispatch/central-dispatch');
 
 const uri = path.resolve(__dirname, '../fixtures/sound.sb2');
 const project = extract(uri);
 
+// By default Central Dispatch works with the Worker class built into the browser. Tell it to use TinyWorker instead.
+dispatch.workerClass = Worker;
+
 test('sound', t => {
     const vm = new VirtualMachine();
     vm.attachStorage(makeTestStorage());
diff --git a/test/unit/blocks_music.js b/test/unit/blocks_music.js
new file mode 100644
index 000000000..3b8f8d949
--- /dev/null
+++ b/test/unit/blocks_music.js
@@ -0,0 +1,48 @@
+const test = require('tap').test;
+const Music = require('../../src/blocks/scratch3_music');
+let playedDrum;
+let playedInstrument;
+const runtime = {
+    audioEngine: {
+        numDrums: 3,
+        numInstruments: 3,
+        instrumentPlayer: {
+            loadInstrument: instrument => (playedInstrument = instrument)
+        }
+    }
+};
+const blocks = new Music(runtime);
+const util = {
+    target: {
+        audioPlayer: {
+            playDrumForBeats: drum => (playedDrum = drum)
+        }
+    }
+};
+
+test('playDrum uses 1-indexing and wrap clamps', t => {
+    let args = {DRUM: 1};
+    blocks.playDrumForBeats(args, util);
+    t.strictEqual(playedDrum, 0);
+
+    args = {DRUM: runtime.audioEngine.numDrums + 1};
+    blocks.playDrumForBeats(args, util);
+    t.strictEqual(playedDrum, 0);
+
+    t.end();
+});
+
+test('setInstrument uses 1-indexing and wrap clamps', t => {
+    // Stub getMusicState
+    blocks._getMusicState = () => ({});
+
+    let args = {INSTRUMENT: 1};
+    blocks.setInstrument(args, util);
+    t.strictEqual(playedInstrument, 0);
+
+    args = {INSTRUMENT: runtime.audioEngine.numInstruments + 1};
+    blocks.setInstrument(args, util);
+    t.strictEqual(playedInstrument, 0);
+
+    t.end();
+});
diff --git a/test/unit/blocks_sounds.js b/test/unit/blocks_sounds.js
index 753f46f0c..9a44e7f9f 100644
--- a/test/unit/blocks_sounds.js
+++ b/test/unit/blocks_sounds.js
@@ -1,18 +1,8 @@
 const test = require('tap').test;
 const Sound = require('../../src/blocks/scratch3_sound');
 let playedSound;
-let playedDrum;
-let playedInstrument;
-const runtime = {
-    audioEngine: {
-        numDrums: 3,
-        numInstruments: 3,
-        instrumentPlayer: {
-            loadInstrument: instrument => (playedInstrument = instrument)
-        }
-    }
-};
-const blocks = new Sound(runtime);
+
+const blocks = new Sound();
 const util = {
     target: {
         sprite: {
@@ -24,8 +14,7 @@ const util = {
             ]
         },
         audioPlayer: {
-            playSound: soundId => (playedSound = soundId),
-            playDrumForBeats: drum => (playedDrum = drum)
+            playSound: soundId => (playedSound = soundId)
         }
     }
 };
@@ -82,30 +71,3 @@ test('playSound prioritizes sound name if given a string', t => {
     t.strictEqual(playedSound, 'fourth soundId');
     t.end();
 });
-
-test('playDrum uses 1-indexing and wrap clamps', t => {
-    let args = {DRUM: 1};
-    blocks.playDrumForBeats(args, util);
-    t.strictEqual(playedDrum, 0);
-
-    args = {DRUM: runtime.audioEngine.numDrums + 1};
-    blocks.playDrumForBeats(args, util);
-    t.strictEqual(playedDrum, 0);
-
-    t.end();
-});
-
-test('setInstrument uses 1-indexing and wrap clamps', t => {
-    // Stub getSoundState
-    blocks._getSoundState = () => ({});
-
-    let args = {INSTRUMENT: 1};
-    blocks.setInstrument(args, util);
-    t.strictEqual(playedInstrument, 0);
-
-    args = {INSTRUMENT: runtime.audioEngine.numInstruments + 1};
-    blocks.setInstrument(args, util);
-    t.strictEqual(playedInstrument, 0);
-
-    t.end();
-});