Patinkin , Klaus Nomi , George Hearn , and Luciano Pavarotti . 10 Discography Albums Josh Groban - 2001 Josh Groban In Concert - 2002 Closer - 2003 Live at the Greek - 2004 Awake - 2006 Concerts Josh Groban In Concert - 2002 CHESS: Actors' Benefit Fund Concert - 2003