For organization's sake, I'll have to categorize this.

Singer/Songwriters: Bob Dylan, Nick Drake, Tom Petty Bands: The Beatles, Spoon, King Gizzard & The Lizard Wizard Rappers: Jay-Z, Kanye West, Little Brother Producers: Rick Rubin, Nigel Godrich, Jeff Lynne Composers: Tchaikovsky, Bach, Beethoven