For me it was KHJ in LA and later KRLA.
We had a deep fight in our house all the time over which station was better - I preferred KHJ, loved their DJs - my siblings preferred KRLA - and would always change the intercom system (remember those?)
Best part about “Once Upon a Time in Hollywood” was KHJ in the background constantly - I told my kids that’s exactly how it was - KHJ (or sometimes KRLA) was ALWAYS playing - in the car, on the intercom, at the pool, at friends’ homes, I had one friend that kept it on 24 hours a day.
Those were good times...