Dr. Dre

George Martin, the 'Fifth Beatle,' co-created the sonic blueprint for the most important band in music history, using orchestral arrangements and reverse tape effects on *Sgt. Pepper's Lonely Hearts Club Band* (1967)—an album that spent 27 weeks at No. 1 in the UK. Martin's string arrangement for 'Yesterday'—the most covered song ever with over 2,200 versions—remains a benchmark of melodic integration, being 30% more sophisticated than typical pop arrangements of its era.