The composer for VVVVVV once released it's soundtrack as PPPPPP, which I literally enjoyed. Though I wasn't able to enjoy the later difficulty of VVVVVV (especially the levels where you had to manouver not only you but a companion), the soundtrack kept me playing and eventually dying. And, well, as I was in need for music floating in head (VVVVVV's soundtrack), I had to get it one way or another. Fortunately, the composer released PPPPPP as 320kbit MP3 in change for a four or ten € donation. I think it's worth paying 10€, as it's resembling authentic melodies for lofi heros of the jumpumping kind. Plus you get the full program of tracks for a game, which's very unlikely today (even for indies).