Play button – add mp3 to your wordpress

Play-button plugin lets you place one or more simple mp3 play buttons to your posts, pages or widget contents.

Upload the plugin directory play-button to the wordpress plugin directory (usually /wp-content/plugins/)
Activate the plugin through the ‘Plugins’ menu in your WordPress administration page
To add a mp3 play button to your post, page or widget contents simply write the following code:

[php][play-button:mysong.mp3][/php]

Instead of mysong.mp3 place the path relative to your wordpress home URL.

Example:

[php][play-button:wp-content/uploads/2009/06/example.mp3][/php]

It can be downloaded from here.