In this 1999 documentary, Pete Townshend, Roger Daltrey and John Entwistle discuss the making of what many consider the Who’s greatest testament to Townshend’s songwriting talent: their classic album “Who’s Next.” Others close to the group weigh in with insights about the late Keith Moon’s importance to the band. The retrospective also features unseen performances of tunes from the platter, including “Won’t Get Fooled Again” and “Baba O’Riley.”