J Dilla & Madlib collaboration released in 2003 under the name Jaylib. Production and vocals shared equally, with Dilla & Madlib rapping over each other's beats.
The project was conceived in fall 2002 after Stones Throw released a limited edition 12" featuring "The Message," a track made by Madlib in 2000, flipping Grandmaster Flash & The Furious Five's lyrics over a J Dilla beat. The song, unofficially credited to "Jaylib," was never intended for commercial release, but it got the two producer/mc's together to talk about an equal collaboration. Dilla & Madlib previously worked together briefly in Detroit, late 2001, on a project which was never completed.