After the well-known “Grandmother tips” of artist Charcho Puebla.
When I was young, I liked to do playlists on mixed cassette tapes. Took time, because you had to be listening to the radio ready, so when that song that you like get played, BAM!
You hit the REC button to get it.
That was “the thing”.
He spread some tapes randomly all over the city of Madrid, with a QRcode so that anyone in the streets has access to playlists selected in themed sets.
Hopefully you get lucky and find one through the streets.