John Derek Yancey, better known by his stage name Illa J, is an American rapper, singer, producer and songwriter from Detroit, Michigan who has released two albums on Delicious Vinyl Records. He is the younger brother of the late hip hop producer, and rapper J Dilla, and a former member of hip hop group Slum Village. He also released a collaborative album as Yancey Boys along with Frank Nitt. Illa J's second solo album ILLA J came out via the Brooklyn based record label, Bastard Jazz.

James Dewitt Yancey, better known by the stage names J Dilla and Jay Dee, was an American record producer and rapper. He emerged during the mid-1990s underground hip hop scene in Detroit, Michigan, as a member of the group Slum Village. He was also a member of the Soulquarians, a musical collective active during the late 1990s and early 2000s.