you can just use one class name for each button and control them at one time
<button class="player-control" id="playpause">play</button>
<audio id="player">
<source src="http://96.47.236.72:8364/;" />
</audio>
<!-- here the other button that needs to start sound too -->
<button class="player-control" id="playpause2">play</button>
<script type="text/javascript">
window.player = $('#player')[0];
$('.player-control').click(function () {
if (player.paused) {
player.play();
$('.player-control').html('pause');
} else {
player.pause();
$('.player-control').html('play');
}
});
</script>