I don't have a lot of audio files kicking around my computer the way I do screenshots1, but I do have one thing.
Back in the early 00s the Pentagon's anthrax vaccination program had a flash-based website with a pretty elaborate opening animation and...a soundtrack. Somebody worked hard on that song, to the point that they included a longer cut of it as a download.
I assume this to be public domain, as it is a work created by and for the federal government. By the way, on the off chance that anybody knows anything about the creation of this website, please let me know, I've been curious about it for decades.
Oh! Looks flash sites are emulated on the wayback machine now! So you can experience it in all its glory!! It's a lot!
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I mean, other than a medium-sized music library which it would not be, um, as fair use for me to upload here piecemeal on a daily basis.