Gregory Marcus has seen 556 bands.

Band Concerts Seen
  Phish 361 concerts
  Tedeschi Trucks Band 23 concerts
  Umphrey's McGee 21 concerts
  Radiohead 19 concerts
  Joe Russo's Almost Dead 15 concerts
  Trey Anastasio 14 concerts
  Dead & Company 12 concerts
  Trey Anastasio Band 11 concerts
  Red Hot Chili Peppers 10 concerts
  "New Orleans Jazz & Heritage Festival" 9 concerts
  Pearl Jam 8 concerts
  Anders Osborne 7 concerts
  Greensky Bluegrass 7 concerts
  Eric Clapton 6 concerts
  Ghosts of the Forest 6 concerts
  Metallica 6 concerts
  moe. 6 concerts
  The Revivalists 6 concerts
  Dave Matthews Band 5 concerts
  Gary Clark Jr. 5 concerts
  The Infamous Stringdusters 5 concerts
  Blues Traveler 4 concerts
  Guns N' Roses 4 concerts
  Lettuce 4 concerts
  Neal Francis 4 concerts