a complete free player is here:
http://www.sean-o.com/jquery/jmp3/it's very very easy
just put the scripts like described in your template
and paste in a Wysiwyg something like this:
<span id="sound" class="mp3">sound.mp3</span>
all .mp3 files are automagical detected....easy and simple
i'm using a Droplet for playing files like [[mp3?url=www.my-domain.com/media/mp3/sound.mp3]] to build the HTML i want.
Regards mr-fan