AC/DC The Bon Scott era with notable mention to Brian Johnson for Back in Black
Black Sabbath
Lynyrd Skynyrd - The original line up.
Metallica
Nirvana
The Who
Led Zeppelin
The Allman Brothers
Pink Floyd
Rolling Stones
I own complete catalogs of many of these and never get tired of listening to them
I could never pick the greatest as they have all made great contributions! Unfortunately, I could go on with the likes of Alice in Chains, Eric Clapton, Van Halen, Aerosmith, Motley Crue, etc...
BTW Dallas you are so right who hasn't gotten down n dirty with Kashmir , Whole Lotta Love, or In the Evening playing in the background.