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Led Zeppelin, right after I discovered Janis Joplin and Credence Clearwater Revival.
LOL... if you just discovered them recently you may also want to check out James Taylor, Allman Brothers, Eagles, Joe Cocker, Pink Floyd, The Who, Harry Chapin, Van Morrison(his rendition of "Please don't go" is awesome), Steve Miller Band, (Crosby, Stills, Nash and Young), Neil Young, Jim Croce, Lynard Skynard just to name a few. :)
They aren't underated, just getting old.
As far as Led Zeppelin goes look for the disc set called "How the West was Won". It's only set you need. :)
[en.wikipedia.org...]
These original performances are from the band's 1972 concert tour of the United States, recorded at the L.A. Forum on June 25, 1972 and Long Beach Arena on June 27, 1972. Guitarist Jimmy Page considers Led Zeppelin at this point to have been at their artistic peak, as is mentioned in the album's liner notes.
[au.youtube.com...]
[au.youtube.com...]
(warning Telecaster p0rn ahead)