William Kiefer has seen 35 bands.

Band Concerts Seen
  Black Sabbath 3 concerts
  King's X 3 concerts
  Citizen Cope 2 concerts
  Van Halen 2 concerts
  AC/DC 1 concert
  America 1 concert
  …And You Will Know Us by the Trail of Dead 1 concert
  Bob Dylan 1 concert
  Clutch 1 concert
  Coheed and Cambria 1 concert
  Collective Soul 1 concert
  Dr Hook & The Medicine Show 1 concert
  Duo Játékok 1 concert
  Eric Clapton 1 concert
  Head East 1 concert
  Kings Of Leon 1 concert
  KISS 1 concert
  K'naan 1 concert
  LAKE 1 concert
  Living Colour 1 concert
  Loose Leaf Fancy 1 concert
  Mötley Crüe 1 concert
  Point Blank 1 concert
  Rammstein 1 concert
  Raphael Saadiq 1 concert