Led zeppelin- For the beautiful music and lively singing, songs like Stairway to heaven, kashmir, all my love, Baby I'm gon' leave you are true classics.
Pink Floyd- A great band that excelled with creating a full album from beginning to end. The madness they presented in their albums which led some to call Roger the gloomiest man in rock and I agree, but that's what made the band. Plus the most overlooked talent they possesed was the different sounds each album presented. I swear if you put someone in a room, have him/her listen to "dark side of the moon", "animals", and "the wall" they'll say these are three different bands. I was hoping they'd reunite for a final tour since every other band seems to be doing that now.
Green day and coldplay are also favorites.