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HTML

            
              <h1>和音鍵盤</h1>
<div id="code_type">
<form name="code_types">
<label><input type="radio" id="code_M" name="code_type" value="codeM" onchange="codeTypeSelect()" checked>
メジャー</label>
 <label>
   <input type="radio" id="code_m" name="code_type" value="codem" onchange="codeTypeSelect()">
  マイナー</label>
</form>
<p id="code_type_text"></p>
</div>
<ul id="piano">
   <li id="C4" class="w_key">C</li>
   <li id="Cs4" class="b_key"></li> 
   <li id="D4" class="w_key">D</li>
   <li id="Ds4" class="b_key"></li> 
   <li id="E4" class="w_key">E</li>
   <li id="F4" class="w_key">F</li>
   <li id="Fs4" class="b_key"></li>
   <li id="G4" class="w_key">G</li>
   <li id="Gs4" class="b_key"></li>
   <li id="A4" class="w_key">A</li>
   <li id="As4" class="b_key"></li>
   <li id="B4" class="w_key">B</li>
   <li id="C5" class="w_key">C</li>
</ul>
!

CSS

            
              h1, #code_type, #code_type_text {
  text-align: center;
}

form {
  margin: 0 auto ;
  display: inline-block;
  border: 1px solid #ccc;
  padding: 10px;
}

label {
  margin: 0 10px;
}

label:hover {
  cursor: pointer;
}

#piano {
  background: #333;
  padding: 10px;
  width: 310px;
  display: block;
  margin: 0 auto;
  position: relative;
}

.w_key {
  background: #FFF;
  border: 0px solid #333;
  width: 34px;
  text-align: center;
  padding:  90px 0 10px;
  display: inline-block;
}

.w_key:hover, 
.b_key:hover {
  opacity: 0.7;
}

.b_key {
  position: absolute;
  z-index: 10;
  top: 10px;
  margin: 0 -20px;
  padding: 0;
  background: #000;
  border: 1px solid #fff;
  color: #fff;
  width: 35px;
  height: 75px;
  text-align: center;
  display: inline-block; 
}

#code_type_text {
  font-size: 20px;
}
!

JS

            
              //DOM
var Key = document.querySelectorAll('#piano li');
var codeTypeText = document.querySelector('#code_type_text');
var codeType = document.getElementsByName("code_type");

//音階
var scale　= [
  //休符
  'null', 
  //1オクターブ目
  'C4', 'C#4', 'D4', 'D#4', 'E4', 'F4', 'F#4', 'G4', 'G#4', 'A4', 'A#4', 'B4',
  //2オクターブ目
  'C5', 'C#5', 'D5', 'D#5', 'E5', 'F5', 'F#5', 'G5', 'G#5', 'A5', 'A#5', 'B5'];

//ルート音
var root = {C4: 0, Cs4: 1, D4: 2, Ds4: 3, E4: 4, F4: 5, Fs4: 6, G4: 7, Gs4: 8, A4: 9, As4: 10, B4: 11, C5: 12};


//コードタイプ
var codeTypes = [
	{'codeName': 'M',
		'codeKeys': [1,5,8]},
	{'codeName': 'm',
		'codeKeys': [1,4,8]}
];

//検証
//console.log(codeTypes[1]['codeKeys'].length);
//console.log(codeTypes[1]['codeKeys'][2]);

//12コード
var twelveCode =[root['C4'],root['Cs4'],root['D4'],root['Ds4'],root['E4'],root['F4'],root['Fs4'],root['G4'],root['Gs4'],root['A4'],root['As4'],root['B4'],root['C5']]

//和音入れ場
var chords = [];

//和音
for (var h = 0 ; h < codeTypes.length; h++ ) {
  chords.push( [] );
  for (var i = 0 ; i < Key.length; i++ ) {
    chords[h].push( [] );
    for (var  j = 0; j < codeTypes[h]['codeKeys'].length; j++){		
      var nmb = scale[twelveCode[i]+codeTypes[h]['codeKeys'][j]];
      chords[h][i].push(nmb); 
    }
  }
}

//コードタイプ設定
  function codeTypeSelect() {
    for(var i = 0; i < codeType.length; i++){
      if(codeType[i].checked) {
        var CodeTypeValue = codeType[i].value;
        codeTypeText.innerHTML = CodeTypeValue;
           return chords[i];
      }
    }
  }

codeTypeSelect();

//シンセ生成
var synth = new Tone.PolySynth().toMaster();

//イベントリスナ
for (var i = 0; i < Key.length; i++) {
(function(i) {
  Key[i].addEventListener('click', function () { 
  //チェックされているコードタイプを確認
  var seletcCords = codeTypeSelect();
  //メジャーコードが4分音符の長さ鳴る
  synth.triggerAttackRelease(seletcCords[i], '4n');
  }, false);
 })(i);
}
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