Cassette tape?

 I was looking  for something to go with this cassette tape fabric the other day and my oldest was trying to be helpful (trying to get me to hurry up) and asked me what fabric was it? I replied the one with cassette tapes. He then said with a puzzled look on his face,what's a cassette tape? I then remembered how old school I am.
It made me feel like my parents and when they would say 8 tracks. This is for the only other person that loves music as much as my husband.