> Musical hacking began with the invention of the cassette tape. / The answer is TRUE. In the 1960s, the arrival of the cassette tape made it easy to duplicate music at a very low cost.

I don't know what "Musical hacking" means, but my grandfather was messing around with reel-to-reel tape in the 1960s, like doing duets with himself. That doesn't require cheap cassette tapes - reel-to-reel was cheap enough for a non-professional to acquire.

At https://en.wikipedia.org/wiki/Musique_concr%C3%A8te#Magnetic... you can see that people were experimenting with a lot of tape-based techniques, like micro-editing, in the 1950s.

Edit: Oh, I think I figured it out. They regard 'hacking' as equivalent to 'copyright infringement', and not as 'experimenting with the medium'.