The playlists of nearly all radio stations are far too short for me. I finally just quit listening to the radio.
Comcast has a bunch of channels with various music categories. They all repeat after about 2 days. So much for that.
With all the zillions of songs available, I don't get why they do that.
You've got to find the rare radio stations with public support and human djs. kexp.org is a great one based out of Seattle with a wild variety of shows and decades of history. Are all the shows to my taste? No. Have I ever heard something being played that was total crap? Honestly, maybe? Because there's genres I don't know enough to gaugue quality, but I haven't twigged to it.
The dial on my receiver is permanently on 90.3 FM. Such a good radio station. I remember one fun drive a couple of years back was themed around “Don‘t let the robots win”[1]. Perhaps it is already time to re-use that theme.
1: https://www.reddit.com/r/KEXP/comments/1459ahb/dont_let_the_...
Money probably? That's the number of song licensed to maximize profit without hurting 80% listeners.
Have you tried KING 98.1? They seem to have a vast playlist.
My local: https://threedradio.com/
("My" meaning local to me, not that it belongs to me)