I don't remember who first told me about Dad Jams.
It was at some type of party and there was drinking and anyway I'm bad with names.
But it was a short-lived room on Turntable.fm, now mostly abandoned (much like, as far as I can tell, much of the site), but very occasionally you can find people in there playing Kenny Loggins and Genesis songs. [Go to the Dad Jams room]
I loved it not because I got to play music that reminded me in any way of my own actual, personal dad, but because it perfectly named and defined a very particular sensibility that's been sort of floating around.
It really nailed down the thing of older, upper middle-class white guys who don't really get it but, with the enthusiasm of a golden retriever, want to put on loud music in their car and really rock out.