Take a critical look inside the cutting-edge band Deep Purple as their decisive years (1969-73) are covered. Examine the emotional departure of Ian Gillan and Ritchie Blackmore, as well as the excessive fighting within the group and how it affected the band and their music over the long run. Also included are insights from music critics and never-before-seen performances of "Concerto for Group and Orchestra," "Mandrake Root" and "Speed King."