Any idea what song is used in tv_music.wav found in Half-Life 2?

[Bruner]

It's used by Valve to test soundscapes. I've been wondering for a while what the original audio is sampled from, and if we can find it somehow. We've already found the origins to the infamous yodeling music (file name music.wav) from the Half-Life 2 leak, as well as pretty much every music ambiance found in Counter-Strike: Source.
I don't think it'd be too hard to find tv_music.wav all things considered.

[Bruner]

Bumping this up for a bit. Again if anyone knows of any leads, please tell.

The file from my knowledge has shown up in almost every Source game to date, even appearing in the files of Half-Life: Alyx which run on Source 2.