John Behan has seen 21 bands.

Band Concerts Seen
  Grateful Dead 12 concerts
  Robert Plant 3 concerts
  Aerosmith 2 concerts
  Anderson, Bruford, Wakeman, and Howe 2 concerts
  Albert Collins, John Hammond, John Lee Hooker, John Mayall, Johnny Copeland, Moses Rascoe 1 concert
  Bob Weir and Rob Wasserman 1 concert
  Crosby, Stills & Nash 1 concert
  Eric Clapton 1 concert
  Flight 1 concert
  George Thorogood & The Destroyers 1 concert
  Jerry Garcia Band 1 concert
  Jimmy Page 1 concert
  Metallica 1 concert
  Mickey Hart/Planet Drum 1 concert
  Phish 1 concert
  Robert Fripp and the League of Crafty Guitarists 1 concert
  The Doobie Brothers 1 concert
  The Monkees 1 concert
  The Who 1 concert
  Tommy Conwell and the Young Rumblers 1 concert
  Yes 1 concert