
Yeah, not Floyd - it's a big seller because its has such mainstream appeal.
You said Innovative.
I'd have to go with Frank Zappa - Freak Out [1966]
While not my favorite of his work, the mixed media approach he used was innovative even today.
It had VERY early use of mixing doo-wop, rock, sound collages (mashups), and other styles ...
Uncle Meat is pretty out there as well ...
I don't believe popularity excludes innovation
Probably Elvis's first RCA album as albums go. Actually innovation in early Rock and Roll was more about singles than albums and the beginning of Rock is rich in innovative singles. Nothing is more innovative than initial invention.
I submit that Dark Side of the Moon is no more Rock and Roll music than Mel Torme's greatest hits is. With the difference that Torme was (IMO) a better singer, better drummer and had better material. And he could swing.
You could make a good case for Never Mind The Bullocks.....Sex Pistols, but that might have been de-evolution.
the pretty things ~ S.F. Sorrow