All of the songs (not including .midi files) that I have set as background music (almost all of them are .mp3 files that play with Windows Media Player) can be downloaded here by simply right-clicking on the title and selecting "Save Target As...".  Feel free to use them on your website or just save them to listen to yourself.  I would have a whole host of others available if not for the limited file space, but this will have to do, at least for now.

"Ballad of the Green Berets" - Ssgt. Barry Sadler

"Have You Forgotten?" - Darryl Worley

"Marine Corps Running Cadence"

"Navy Seals Battle Theme" (not sure where this was from)

"Marines' Hymn"

"Taps"