What was the
FIRST concert you ever attanded? (Artist/Group and tour)
KOOL 105's Kool Concert in '85 (Parents dragged my unenthused ass to see the Beach Boys and Jerry Lee Lewis)
What was the
BEST concert you ever attended?
Pink Muthafunkingawesome Floyd 1994 Division Bell Tour, Mile High Stadium
(Metallica '91 at McNichols was a distant second)
What was the most
RECENT concert you've attended?
Heading to see Joe Satriani tonight in Anaheim! I just saw the Cocachella festival this Sunday and saw TOOL! My ears are still ringing!
What group/artist have you
seen the most in concert?
Joe Satriani. Seen him over 20 times by now, and it never gets old 
Edited to add one more question:
Who have you NOT seen but REALLY would LOVE to see?
I would have loved to have seen the Doors, Pink Floyd with Roger Waters, Boston, Peter Gabriel, Alice In Chains, Yes