Audio Shortcode plugin
The PixoPoint Audio shortcode plugin allows you to display a flash MP3 player on your site through the use of a WordPress shortcode.
Simply upload an mp3 file somewhere on the internet and link to it using the [audio] shortcode as in the following example:
[audio http://pixopoint.com/uploads/Kalimba.mp3]
PixoPoint Audio shortcode WordPress plugin in action