"First shown on the BBC in a shorter form, Sum Of The Parts is a straight chronological telling of the band's lengthy career (with detours into solo work), in which every member speaks openly about the motivations behind the music and, in the case of Anthony Phillips, Peter Gabriel and Steve Hackett, why they chose to leave. Gabriel and Tony Banks are remarkably honest about their clashes during the making of The Lamb Lies Down On Broadway, the singer's magnificent obsession that ultimately led to his departure".