That is, rock bands that featured keyboards/synth etc.
Off the top of my head, bands like Boston, Floyd, Kansas & Deep Purple come to mind.
But there are other bands that have made thier mark with em in their own unique way. Yes, Styx & even Devo. The Doors & Uriah Heep also had an impact.
Could also add Kraftwerk, Ultravox and Depeche Mode.
Not so much Rock but OMD is a firm favourite of mine, well the albums anyway, didn't really like the 'chart' music, too poppy, I guess the same for Gary Numan.
Horse the Band and Arsonists Get All the Girls have some pretty sweet, intense keyboard action. But that's "grindcore" music.
Pink Floyd aren't really a "keyboard rock band".... There's not that much keyboard work on Floyd albums that stands out or is particularly significant.
Some better examples:
I would say Can, but they weren't really a extremely keyboard heavy band. Anyway, other bands that come to mind:
-The Doors (Manzarek played a key part in the Doors sound)
-The Who (would synths count as keyboards?)
1.) Pink Floyd
2.) The Doors
3.) Deep Purple
4.) Emerson, Lake & Palmer