Mattis has seen 23 bands.

Band Concerts Seen
  Beat the Drum - Runrig Experience 1 concert
  Catapults (D) 1 concert
  Def Leppard 1 concert
  Deichkind 1 concert
  Epica 1 concert
  Four Year Strong 1 concert
  Hellsingland Underground (SWE) 1 concert
  Hurts 1 concert
  Ice Nine Kills 1 concert
  Interpol 1 concert
  James Blunt 1 concert
  Luke Mockridge 1 concert
  Metallica 1 concert
  Mötley Crüe 1 concert
  Nico Santos 1 concert
  Sarah Connor 1 concert
  Sunrise Avenue 1 concert
  Temmis 1 concert
  The Offspring 1 concert
  The Smashing Pumpkins 1 concert
  Trash Boat 1 concert
  Wincent Weiss 1 concert
  Wirtz 1 concert