John Robertson has seen 10 bands.

Band Concerts Seen
  Sammy Hagar 5 concerts
  David Lee Roth 2 concerts
  Krokus 2 concerts
  Triumph 2 concerts
  Billy Squier 1 concert
  Lynyrd Skynyrd 1 concert
  Metallica 1 concert
  Molly Hatchet 1 concert
  Ozzy Osbourne 1 concert
  Sammy Hagar and The Waboritas 1 concert