Button = document.querySelector(".play-melody");
			var startAllButton = document.querySelector(".play-all");
			var stopAudioButton = document.querySelector(".stop-audio");

			startChordsButton.addEventListener("click", function() {
				var options = {voicesOff: true};
				play(options);
			});

			startMelodiesButton.addEventListener("click", function() {
				var options = {chordsOff: true};
				play(options);
			});

			startHarmonyButton.addEventListener("click", function() {
				var options = {chordsO