It can be fun to play old cassettes. Most of them are still playable. It was the first medium where average people could make their own mixes. The more adventurous of us also used the microphone to tape voices, our cars and our pets. Tapes from the radio. Tapes from our singles collection. Tapes from television shows. I just discovered I had a tape of a radio show dedicated to the life of Ernest Hemingway which featured Lil Abner's Al Capp giving a critique on the man. Theoretically I could transfer them all to CD but the amount of work for a non-retired man is too great. Cassette tapes are part of the flotsam and jetsam sum of our lives. They may be irrelevant but they are our flotsam and jetsam.
Editor's note: I just found the Hemingway show on YouTube. Maybe I can give some of my cassettes the heave-ho after all.