Here you can see a demo version of the MP3 audio player, which is available as modules for the CMS ProcessWire. The module based on flash-mp3-player is written by me and license free.
More information about the module:
You can hear (if you want): The Étude Op. 2 No. 1 by Alexander Scriabin played by Lena Selyanina.
Provision of audio files by the browser's own players using the html tags <audio> (not supported by all browsers).
or with the module described above