Nothing divides the world quite like Yes music. For the fans its a sublime journey into melody and form. For the critics its an abominable noise. This is the long awaited critical review of the music of Yes during the crucial first five years of the bands history. Using rare archive film we trace the development of the band from it's first album through to the controversy surrounding the release of Topographic Oceans and the departure of Rick Wakeman. Featuring in depth interviews with the band and archive footage of performances of material from every album a leading team of critics and musicologists critically assess the music to discover the essence of Yes.