One sign of terrestrial radio's decline: I can't remember the last time I saw a bumper sticker for a rock station on any car here. One contemporary Christian station is well-represented with bumper stickers here, but it's the only station I've seen advertised that way recently.
In the early '80s, I remember seeing a fair number of KSHE and KWK bumper stickers. It was a mark of a listener's loyalty to a particular album rock station. Somehow, I don't see bumper stickers for music streaming services taking off in the same way.
