Xero has seen 21 bands.

Band Concerts Seen
  Breaking Benjamin 2 concerts
  All That Remains 1 concert
  Chevelle 1 concert
  Chronic Future 1 concert
  Dog Fashion Disco 1 concert
  Dying Fetus 1 concert
  Full Blown Chaos 1 concert
  GWAR 1 concert
  Hatebreed 1 concert
  "Jagermeister Music Tour" 1 concert
  Killswitch Engage 1 concert
  Korn 1 concert
  Mastodon 1 concert
  Mensrea 1 concert
  No Warning 1 concert
  Papa Roach 1 concert
  Sick of It All 1 concert
  Skindred 1 concert
  Slayer 1 concert
  Terror 1 concert
  Trust Company 1 concert