Lots of bands that I idolise, I wouldn't class as rock exactly - The Beatles, The Small Faces, The Kinks, The Smiths, Ride, The Beach Boys, The Yardbirds, The Charlatans, Velvet Underground, Verve for example, but for proper rock these would be on my list (in no order except top two) :
Focus
Pink Floyd
Free
Bad Company
Jimi Hendrix Experience
Steely Dan
Rush
Queen
Cream
Led Zeppelin
Golden Earring
Nirvana
AC/DC
Rolling Stones
Alice Cooper
Guns 'N' Roses
Boston
Supertramp
The Who
Lynyrd Skynyrd
Tom Petty and The Heartbreakers
King Crimson
Jethro Tull
Deep Purple
Santana
Crosby, Stills, Nash and Young
Yes
Bruce Springsteen and The E Street Band
Emerson, Lake and Palmer
Bob Seger and The Silver Bullet Band
The Doors
Van Halen
Aerosmith
The Byrds
Kiss