Edit in JSFiddle

// band.js https://github.com/meenie/band.js
// arrangement via http://herbalcell.com/static/sheets/legend-of-zelda/overworld-labels.pdf
var music = new BandJS();
music.load(musicjson);
music.end();
music.onFinished(function() {
    playing = false;
    enablePlay();
});
function enablePlay() {
    playButton.disabled = false;
    pauseButton.disabled = true;
    stopButton.disabled = true;
}
function playZelda() {
    playButton.disabled = true;
    pauseButton.disabled = false;
    stopButton.disabled = false;
    music.play();
    playing = true;
}
function pauseZelda() {
    if (playing) {
        music.pause();
        playing = false;
    }
    else {
        music.play();
        playing = true;
    }
}
function stopZelda() {
    music.stop();
    playing = false;
    enablePlay();
}
var playButton = document.getElementById("playButton"),
    pauseButton = document.getElementById("pauseButton"),
    stopButton = document.getElementById("stopButton"),
    playing = false;
playButton.onclick = playZelda;
pauseButton.onclick = pauseZelda;
stopButton.onclick = stopZelda;