I almost said 72.. and Jim makes a good point about looking at stuff on a song for song basis..
I'm also sitting on major artists I haven't really included yet; Elvis, Beatles, Beach Boys, Doors, Johnny Cash, Led Zepplen, Aerosmith, not to mention a trunk load of 50s stuff.
This summer at car shows, I'll program an MP3 player to play the tunes softly as you are near the car. Might even grow some big chops, put the Hot Wife in a mini skirt and take up smoking too?