J1 Sy has seen 380 bands.

Band Concerts Seen
  The Dillinger Escape Plan 4 concerts
  Anthrax 3 concerts
  Baroness 3 concerts
  Bullet for My Valentine 3 concerts
  Deftones 3 concerts
  Killswitch Engage 3 concerts
  Metallica 3 concerts
  Slayer 3 concerts
  Airbourne 2 concerts
  Amon Amarth 2 concerts
  Amyl and the Sniffers 2 concerts
  Battles 2 concerts
  Bring Me The Horizon 2 concerts
  Dragonforce 2 concerts
  Fear Factory 2 concerts
  Frenzal Rhomb 2 concerts
  Ghost 2 concerts
  Iron Maiden 2 concerts
  Jane's Addiction 2 concerts
  Lamb Of God 2 concerts
  Mastodon 2 concerts
  Millencolin 2 concerts
  Opeth 2 concerts
  Queens of the Stone Age 2 concerts
  Sepultura 2 concerts