I don't have much to add, but there is one station (KLOS 95.5) that plays Classic Rock--the tag is though "It doesn't have to be old to be a classic." So if you say they are listening to KLOS, you can get away with any rock music from around '68 to the mid-90's. And of course "rock" is loosely defined--I've heard everything from punk to grunge to Zep to the Beatles. They played Nirvana once and I about had a heart attack. "Nirvana isn't classic, motherfuckers!" That was before I understood their format....
no subject