Having moved from jazz, Blues and R'n'B to out-and-out pop in his various 1960s bands, keyboard player Manfred Mann went back to the drawing board in 1971 with a new quartet, Manfred Mann's Earth Band, and the intention of focusing on progressive rock. With a repertoire that leant partly on radical rearrangements of songs by Bob Dylan and then Bruce Springsteen, largely instrumental epics that borrowed from Gustav Holst's The Planets suite, and improvisations...