For those looking for an inline example, here is one:
<audio controls style="width: 200px;">
<source src="http://somewhere.mp3" type="audio/mpeg">
</audio>
It doesn't seem to respect a "height" setting, at least not awesomely. But you can always "customize" the controls but creating your own controls (instead of using the built-in ones) or using somebody's widget that similarly creates its own :)