Mouseover Media Player
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Your may have to agree to let the Windows Media Player run (or your default .mid, .au or .wav selection for a player), based on your security settings. This particular midi-player has 5 sample selections already but you can add as many as you wish. Add your own audio files by following the pattern already in the script. Although this was originally written for IE4 and up, this should work in all modern browsers that are loaded with add-ins for that file type. It has been tested (August 2009) with browsers such as IE and FireFox. This calls your local default midi selection player such as QuickTime or Media Player (or others).
Up mouseover, there is audio in the background.