I've probably seen about 40 artists live, and my top 3 were the three non-rap performances that I saw:
Rage Against the Machine
Tom Petty (with Allman Bros and Black Crows)
The Machine (Floyd Cover Band)
George Clinton and the Parliament Funkadelic
Tech N9ne (Good when there aren't any juggalos)
Atmopshere (One AMAZING concert, one average concert, one bad concert)
Murs (Great solo and as Felt)
J5, the Roots, Nerd, etc.
I also saw DJ Danny Tenaglia when I was in Ibiza, Spain. I don't like techno much, but he put on an 8 hour long set that made me really respect what he did.
Tons and tons of average concerts I dont feel like naming.
Mentionable let downs: Wu-Tang, Nas, Bone Thugs.
My alltime favorite concert: NINJA TURTLES CONCERT TOUR circa 1990!