Prince
Black Thought
Russ Elevado
Jimi Hendrix
Rah Digga
Jill Scott
Omar
Larenz Tate
The Neptunes
D'Angelo
Big Daddy Kane?

Don't know anybody else...
Erykah Badu
?uestlove
Mary J Blige
Cee-Lo
Jay Dee
His mama
His daughter
Bilal
Pops
Q-Tip
Pino Palladino
James Poyser
Farrakhan