The Beatles
Level 42 (very underated group)
Stevie Wonder
Sting
Steely Dan
Crash test dummies
Coldplay
Diana Ross and the Supremes
Elton John
Billy Joel
Norah Jones
John Legend
Genesis
Phil Collins
Queen and Freddie Mercury
Gnarls Barkley
Ottmar Liebert
Leonard Cohen
Peter Gabriel
Chopin
This list could extend ....forever