Another kind of hackability: There is a whole little music genre called "tape loops" where people make music by cutting open cassettes and taping the ends of the tape to make infinite loops. You record onto a few of those of different lengths, play them back in parallel and get neat rhythmic effects as the loops go in and out of phase with each other.

AMULETS is a good example of a musician making songs like this: https://www.youtube.com/watch?v=CVon_9VmMEc

The r/tapeloops subreddit is a nice little community for it.