In the 80s and 90s, I Bought many music cassettes which seemed to be an interim format between vinyl and CDs. I likely made hundreds of radio airchecks by taping NYC radio stations and trading with people in other cities for tapes of stations in their markets. I also enjoyed making radio airchecks when traveling to other cities. This hobby seems to be obsolete since most radio stations are on the web.
Anyway, I just bought a tape player as seen above that can convert tapes to mp3 files. The only problem is that the transfer has to be done in real time. Thus it would take forever to convert all of my tapes to mp3 files. Well, I guess since I am now retired, I'll have the time to do that. :)