David Cho has seen 1560 bands. (Page 46)

Band Concerts Seen
  Odd Future 1 concert
  Of Monsters and Men 1 concert
  OhGr 1 concert
  Ohmme 1 concert
  Oh Wonder 1 concert
  OK Cool 1 concert
  Omar Souleyman 1 concert
  Omen 1 concert
  Once and Future Band 1 concert
  Oneida 1 concert
  Oneohtrix Point Never 1 concert
  Opeth 1 concert
  Origin of Animal 1 concert
  Orion Meadows 1 concert
  Orville Peck 1 concert
  Oso Oso 1 concert
  Otoboke Beaver 1 concert
  OTTTO 1 concert
  Ought 1 concert
  OutKast 1 concert
  Oux 1 concert
  Overkill 1 concert
  Owen Bones 1 concert
  Ozzuario 1 concert
  Palehound 1 concert