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HTML 

              
                <h1>マリオBGM</h1>
<div id="btn">
   <div id="play">Play</div>
   <div id="stop">Stop</div>
</div>

<p>※注：音が出ます！</p>
!

CSS 

              
                h1, p {
  text-align: center;
}

#btn {
  display: flex;
  justify-content: center;
}

#btn div {
  font-size: 25px;
  line-height: 1em;
  background: #eee;
  border: 2px solid #ccc;
  border-radius: 10px;
  text-align: center;
  width: 90px;
  padding: 30px 0;
  display: block;
  margin: 0 10px;
  drop-shadow: 10px;
}

#btn div:hover {
  opacity: 0.7;
  cursor: pointer;
}
!

JS 

              
                //DOM
const btn = document.getElementById("btn");
const play = document.getElementById("play");
const stop = document.getElementById("stop");

//STOPボタン非表示
stop.style.display = "none"; 

//メロディ
//イントロ
const intro = [
  'E5', 'E5', null, 'E5', 
  null, 'C5', 'E5', null,
  'G5', null, null, null,
  'G4', null, null,  null,
]

//Aメロ
const A1 = [
  'c5',null, null,'G4',
  null, null,'E4', null,
  null, 'A4', null, 'B4',
  null, 'A#4', 'A4', null,
]
const A2 = [
  'G4', 'C5', 'E5', 'A5',
  null, 'F5', null, 'G5',
  null, 'E5', null, 'C5',
  'D5', 'B4', null, null,
]

//Bメロ
const B1 = [
  null, null,'G5', 'F#5', 
  'F5', 'D5#', null,'E5',  
  null, 'G4', 'A4', 'C5', 
  null, 'A4', 'C5', 'D5',
] 
const B2 = [
  null, null, 'G5', 'F#5', 
  'F5', 'D5', null, 'E5', 
  null, 'C6', null, 'C6',
  'C6',  null, null, null,
]
const B3 = [
  null, null, 'D#5', null, 
  null, 'D5', null, null, 
  'C5', null, null, null,
  null,  null, null, null,
]

//Cメロ
const C1 = [
  'C5', 'C5', null, 'C5',
  null, 'C5', 'D5', null,
  'E5', 'C5', null, 'A4',
  'G4', null, null, null,
] 
const C2 = [
  'C5', 'C5', null, 'C5',
  null, 'C5', 'D5', 'E5',
  null, null, null, null,
  null, null, null, null,
]

//Dメロ
const D1 = [
  'E5','C5',null,'G4',
  null,null,'G#4',null,
  'A4','F5',null,'F5',
  'A4',null,null,null,
]
const D2 = [
  'B4','A5',null,'A5',
  'A5','G5', null,'F5',
  'E5','C5',null,'A4',
  'G4',null,null,null,
]
const D3 = [
  'B4','F5',null,'F5',
  'F5','E5', null,'D5',
  'C5',null,null,null,
  null,null,null,null,
]

//曲構成
var melodyLine = 
  //イントロ  
  intro.concat(
  //Aメロ
  A1, A2, A1, A2, 
  //Bメロ
  B1, B2, B1, B3, 
  B1, B2, B1, B3, 
  //Cメロ
  C1, C2, C1, intro, 
  //Aメロ
  A1, A2, A1, A2, 
  //Dメロ
  D1, D2, D1, D3, 
  D1, D2, D1, D3, 
  //Cメロ
  C1, C2, C1,
  );

//音源オプション
const option = {
  envelope: {
    attack: 0.05,
    decay: 0.05,
    sustain: 0.5,
    release: 3,
  },
  portamento: 0.1,
  volume: -20,
} 

// エフェクト（リバーブ）
const reverb = new Tone.Freeverb(0.8,500).toMaster();


//再生ボタン
play.addEventListener("click", function () { 

//ボタン表示切替
play.style.display = "none"; 
stop.style.display = "block"; 

//音源
const synth = new Tone.MonoSynth(option).toMaster(); 
 
// シンセとエフェクトを接続
synth.connect(reverb);

//8分音符で再生
function setPlay(time, note) { synth.triggerAttackRelease(note,'8n', time);
}


//メロディをセット  
const melody = new Tone.Sequence(setPlay, melodyLine); 

//メロディ再生
melody.start();

//ループ回数
melody.loop = 5; 

//テンポ
Tone.Transport.bpm.value = 400;
  
//再生実行
Tone.Transport.start(); 

}, false);


//停止ボタン
stop.addEventListener("click", function () { 
 
//ボタン表示切替
stop.style.display = "none"; 
play.style.display = "block"; 

//停止実行
Tone.Transport.stop();
//イベントクリア
Tone.Transport.cancel();

}, false);
!
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