I've seen a lot of shows but I have to say I'm beyond impressed with some of these lists. Here are a few of my memorable nights--not necessarily the biggest bands but the shows that stay with me:
X (1981, I think; I've since interviewed John Doe a couple times)
Husker Du (also around 1981, when they were hardcore and LOUD and ferocious)
Stevie Ray Vaughan (early 80s, in a club; absolutely smoking)
The Dead (1978, my first of countless Dead shows)
Jean Redpath, late 70s; beautiful
The Takacs Quartet (Bartok cycle; NYC; brilliant)
Trey Anastasio (with classic TAB, small club; jam city)
Bill Monroe (the man, the myth, the legend)
The Furors (anyone from New Haven?)
Gang of Four (1982?)
The Stones (2012, Boston Garden, my son's first concert!)
Lou Reed (small club, with Robert Quine; Lou made lots of eye contact with everyone)