John Derek Yancey, better known by his stage name Illa J, is an American rapper, singer, record 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.