C.Oosterbos has 6 Dream Theater concerts.

Dream Theater is an American progressive metal band formed in 1985 under the name Majesty by John Petrucci, John Myung and Mike Portnoy while they attended Berklee College of Music in Boston, Massachusetts. They subsequently dropped out of their studies to concentrate further on the band that would eventually become Dream Theater. Their current lineup consists of Petrucci, Myung, vocalist James LaBrie, keyboardist Jordan Rudess and drummer Mike Portnoy.