Beatles
Zeppelin
Sabbath
Dylan
Sex Pistols
Metallica
To this, I'll add Stones, Hendrix, Floyd and Queen, I think.
Look, EVERYBODY knows who the Beatles and Stones are, and most know who Led Zeppelin are. Yes is not in the same league as those 3 (or 4, if you wanted to include The Who).
The reason I haven't even considered the Who is because I barely know a thing about them. I know they made Tommy and Quadrophenia, but I don't know a single song on either album (as far as I know). The only songs of theirs I can name at all are My Generation and Pinball Wizard.
In fact, I'd argue in place of Perpetual Change that if there was any major rock band whose reputation has dwindled the most in recent decades, it would be the Who and not the Stones. I know plenty of people into classic rock, and can only think of one guy who listens to the Who. And on that note, no-one who listens to The Byrds.
I'm quite surprised to have not seen the Grateful Dead or the Eagles on anyone's list (though I only skimmed the thread).