Back in the 80's they had beef. In the 90's they squashed it. Now they're making an album together. KRS-One and Marley Marl have united for Hip-Hop Lives through Koch Records. Here's the press release:

KOCH Records to Release New Album by Legendary Hip-Hop Artists KRS-ONE & Marley Marl

“Hip-Hop Lives” to Be Released on May 22nd, 2007 (Executive Produced by Marley Marl)

NEW YORK, NY — (MARKET WIRE) — Mar 21, 2007 — KOCH Records is thrilled to announce the release of a brand new album by legendary Hip Hop artist/philosopher KRS-ONE. The album, titled “Hip Hop Lives,” is Executive Produced by Marley Marl and will be released on May 22nd, 2007.

“Hip Hop Lives” (title track) and “Kill A Rapper” lead the album project …