No-one's said The Beatles yet! I'm sure REBEL will back me up here at least.
I'll back you up, too, glospurs. I admit I was afraid I'd be booed off the board if I said The Beatles. I recently re-listened to the White Album, and was amazed anew at the variety of styles the fab four covered. They wrote and played everything, and they were always evolving.
It seems they never dipped in quality at any stage, they just accumulated new ways of playing.
After spending all day listening to the Kinks today, I'm not sure which is the better band. Probably The Beatles, as their style was more varied, but Ray Davies' songwriting is just as good as Lennon/McCartney. Anyway, the Greatest Band of All Time has to be from the 60s. That's the conclusion...
It seems they never dipped in quality at any stage, they just accumulated new ways of playing.