Mack O Brien has seen 48 bands.

Band Concerts Seen
  Joyce Manor 13 concerts
  Alvvays 4 concerts
  Alex G 2 concerts
  Future Islands 2 concerts
  The Cure 2 concerts
  The Front Bottoms 2 concerts
  Weezer 2 concerts
  Alanis Morissette 1 concert
  alt-J 1 concert
  blink-182 1 concert
  Cherry Glazerr 1 concert
  Citizen 1 concert
  "Coachella Valley Music & Arts Festival" 1 concert
  David Byrne 1 concert
  Deftones 1 concert
  Drab Majesty 1 concert
  Duran Duran 1 concert
  Father John Misty 1 concert
  First Aid Kit 1 concert
  Grumpster 1 concert
  Horse Jumper of Love 1 concert
  Hotline TNT 1 concert
  Hozier 1 concert
  Japanese Breakfast 1 concert
  Jawbreaker 1 concert