Now, this sounds like I'm contradicting my point about oldies listeners being burned out, but I'm not. People want to hear the same thing over and over -- to a point. For years a guy played a piano on the bed of a pickup truck at Fisherman's Wharf. For about 5 of those years people kept requesting The Sting (meaning the Scott Joplin tune, The Entertainer). Though he loved the song he hated playing it because he'd have to play it 10 or 15 times a day. But then the song wore out and people simply did not request it anymore. Even the songs with the strongest legs of all eventually burn out."
I've become convinced that radio is almost subliminal for many people. I work in a company with a diverse workforce - it's probably roughly equal proportions of white and African-American, with smaller groups of Latinos and Asians. But in age, most of us range from their mid 40s to late 50s. Many people play their radio in the cubicles or offices, and the top choice is always "old school" (classic soul) from either KBLX or Kiss-FM, though a few like the "mellower" sounds of KKSF. But all 3 stations play the same 50 or so core 60s and 70s soul songs - "I Heard it Through the Grapevine," "Let's Stay Together," "Ain't No Mountain High Enough,"etc.. These songs are played by each station in heavy rotation every single day in mind-numbing repetition. I used to love these songs, but being a bit of a music geek myself, I now find that hearing them is almost painful.
A few months ago, I asked a co-worker who was happily singing along with Al Green, if he was aware that the song was heard in the office at least 3 times every day. He looked at me with a confused expression...it had obviously never occurred to him, because he wasn't paying that much attention.