J Douma has seen 10 bands.

Band Concerts Seen
  Caligula's Horse 1 concert
  Four Stroke Baron 1 concert
  Gazpacho 1 concert
  Iron Maiden 1 concert
  Leprous 1 concert
  Opeth 1 concert
  TesseracT 1 concert
  The Callous Daoboys 1 concert
  The Hirsch Effekt 1 concert
  Unprocessed 1 concert