Re: Concerts that surpised you as to how good the band was
1. Supplied a mixer to a gig in the late '80s. Turned out the artist was Flock of Seagulls. Needless to say my expectations weren't very high. They blew me away. Amazing players, and their live version of their hits were nothing like what you remember from MTV.
2. My Billy Idol story ends with me becoming a life-long Steve Stevens fan. Steve's solo piece (normally guitarist's live solo pieces were complete wank-fests in that era) was a complete Bach organ concerto played solo on a Roland guitar synth. Stunning.