All of mine were compilations of C64, SNES, and Game Boy music, made by lovingly holding my Talkboy up to the speakers of the TV as the right song played.

I'm not even making this up. I still have all of these tapes somewhere. One of them includes the Hall of Fame music (and relevant Pokemon cries) for my very first time beating the Elite Four.

The kicker is that I would listen to these pretty much daily. And also that I was in high school.

No shame.