We've discussed "audiophile" prerecorded cassettes, I've posted a rack of Naks cranking out copies in real time somewhere around here. Same issue as above over on worldradiohistory.com
Philips Musicassettes from 1970, it's interesting what the choice of music was for the new format, very similar to CDs, we had stored packed with cheap music nobody wanted, anything good was 3x the price.