Will Cooper sings John Legend's All of Me in 20 different voices! Voices listed below: 1. Will Cooper 2. Willie Nelson 3. Neil Diamond 4. Rufus Wainwright 5. Michael Buble 6. Kermit 7. Gollum 8. Andrea Bocelli 9. Jack Black 10. Justin Timberlake 11. Michael McDonald 12. John Legend 13. Elmo 14. Shaggy 15. Popeye 16. Johnny Cash