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abcjs
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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="examples-styles.css"/>

	<link rel="icon" href="favicon.ico" type="image/x-icon"/>
	<title>abcjs: Tempo Demo</title>

	<script src="../dist/abcjs-basic.js" type="text/javascript"></script>
	<script type="text/javascript">
		var abc = "T: Cooley's\n" +
			"M: 4/4\n" +
			"L: 1/8\n" +
			"R: reel\n" +
			"K: Emin\n" +
			"|:D2|EB{c}BA B2 EB|~B2 AB dBAG|FDAD BDAD|FDAD dAFD|\n" +
			"EBBA B2 EB|B2 AB defg|afe^c dBAF|DEFD E2:|\n" +
			"|:gf|eB B2 efge|eB B2 gedB|A2 FA DAFA|A2 FA defg|\n" +
			"eB B2 eBgB|eB B2 defg|afe^c dBAF|DEFD E2:|";

		var abcQ = "T: Cooley's\n" +
			"M: 4/4\n" +
			"L: 1/8\n" +
			"R: reel\n" +
			"Q: 1/4=150\n" +
			"K: Emin\n" +
			"|:D2|EB{c}BA B2 EB|~B2 AB dBAG|FDAD BDAD|FDAD dAFD|\n" +
			"EBBA B2 EB|B2 AB defg|afe^c dBAF|DEFD E2:|\n" +
			"|:gf|eB B2 efge|eB B2 gedB|A2 FA DAFA|A2 FA defg|\n" +
			"eB B2 eBgB|eB B2 defg|afe^c dBAF|DEFD E2:|";

		function load() {
			var visualObjQ = ABCJS.renderAbc("paper-q", abcQ, {
				responsive: "resize" })[0];

			var visualObjP = ABCJS.renderAbc("paper-param", abcQ, {
				responsive: "resize" })[0];

			var visualObjD = ABCJS.renderAbc("paper-default", abc, {
				responsive: "resize" })[0];

			var visualObjDQ = ABCJS.renderAbc("paper-default-q", abcQ, {
				responsive: "resize" })[0];

			var visualObjs = {
				q: visualObjQ,
				param: visualObjP,
				default: visualObjD,
				defaultQ: visualObjDQ,
			}

			var options = {
				q: { visualObj: visualObjQ },
				param: { visualObj: visualObjP, options: { qpm: 100 } },
				default: { visualObj: visualObjD, options: { defaultQpm: 60 } },
				defaultQ: { visualObj: visualObjDQ, options: { defaultQpm: 60 } },
			}

			// This object is the class that will contain the buffer
			var midiBuffer;

			var startAudioButton = document.querySelectorAll(".activate-audio");
			var stopAudioButton = document.querySelectorAll(".stop-audio");

			for (var i = 0; i < startAudioButton.length; i++) {
				startAudioButton[i].addEventListener("click", startAudio);
			}

			for (i = 0; i < stopAudioButton.length; i++) {
				stopAudioButton[i].addEventListener("click", stopAudio);
			}

			function startAudio() {
				var type = this.dataset.type;
				this.setAttribute("style", "display:none;");
				if (ABCJS.synth.supportsAudio()) {
					var stopButton = document.querySelector('.stop-audio[data-type="' + type + '"]');
					stopButton.setAttribute("style", "");

					window.AudioContext = window.AudioContext ||
						window.webkitAudioContext ||
						navigator.mozAudioContext ||
						navigator.msAudioContext;
					var audioContext = new window.AudioContext();
					audioContext.resume().then(function () {
						// In theory the AC shouldn't start suspended because it is being initialized in a click handler, but iOS seems to anyway.

						midiBuffer = new ABCJS.synth.CreateSynth();

						options[type].audioContext = audioContext;
						return midiBuffer.init(options[type]).then(function (response) {
							return midiBuffer.prime();
						}).then(function () {
							midiBuffer.start();
							return Promise.resolve();
						}).catch(function (error) {
							if (error.status === "NotSupported") {
								stopButton.setAttribute("style", "display:none;");
								var audioError = document.querySelector(".audio-error");
								audioError.setAttribute("style", "");
							} else
								console.warn("synth error", error);
						});
					});
				} else {
					var audioError = document.querySelector(".audio-error");
					audioError.setAttribute("style", "");
				}
			}

			function stopAudio() {
				var type = this.dataset.type;
				var startButton = document.querySelector('.activate-audio[data-type="' + type + '"]');
				startButton.setAttribute("style", "");
				this.setAttribute("style", "display:none;");
				if (midiBuffer)
					midiBuffer.stop();
			}
		}
	</script>
</head>
<body onload="load()">
<main>
  <header>
    <img src="https://paulrosen.github.io/abcjs/img/abcjs_comp_extended_08.svg" alt="abcjs logo">
    <h1>Tempo</h1>
  </header>
	<div class="container">
		<p>Tempo can be set in various ways: it can be specified in the ABC string, it can be specified in the
			parameters passed in, or a default can be set that is only used if the tempo is not in the string.
		</p>
		<div class='audio-error' style="display:none;">Audio is not supported in this browser.</div>
		<h2>Specified in the ABC String</h2>
		<p>The tempo is set using the <span class="code">Q: 1/4=150</span> line.</p>
		<div id="paper-q"></div>
		<div class="row">
			<div>
				<button class="activate-audio" data-type="q">Activate Audio Context And Play</button>
				<button class="stop-audio" data-type="q" style="display:none;">Stop Audio</button>
			</div>
		</div>

		<h2>Passed in as a Parameter</h2>
		<p>The tempo is set using the <span class="code">{ qpm: 100 }</span> attribute. Notice that this overrides the tempo in the <span class="code">Q:</span> line.</p>
		<div id="paper-param"></div>
		<div class="row">
			<div>
				<button class="activate-audio" data-type="param">Activate Audio Context And Play</button>
				<button class="stop-audio" data-type="param" style="display:none;">Stop Audio</button>
			</div>
		</div>

		<h2>Using a default</h2>
		<p>The tempo is set using the <span class="code">{ defaultQpm: 60 }</span> attribute. Notice there is no <span class="code">Q:</span> line.</p>
		<div id="paper-default"></div>
		<div class="row">
			<div>
				<button class="activate-audio" data-type="default">Activate Audio Context And Play</button>
				<button class="stop-audio" data-type="default" style="display:none;">Stop Audio</button>
			</div>
		</div>

		<p>The tempo is set using the <span class="code">{ defaultQpm: 60 }</span> attribute. However, there is a <span class="code">Q:</span> line, so that takes precedence.</p>
		<div id="paper-default-q"></div>
		<div class="row">
			<div>
				<button class="activate-audio" data-type="defaultQ">Activate Audio Context And Play</button>
				<button class="stop-audio" data-type="defaultQ" style="display:none;">Stop Audio</button>
			</div>
		</div>

	</div>
</main>
</body>
</html>