Hip hop icon LL Cool J once revealed that he collaborated with Michael Jackson on a track that was never released, and now, a physical copy of one of their songs has surfaced.

According to The Hollywood Reporter, former California Highway Patrol officer Gregg Musgrove recently discovered several DAT tapes containing unreleased Michael Jackson music in a storage unit he purchased in Van Nuys, California. The unit previously belonged to music producer Bryan Loren, who Musgrove claims he’s been unable to locate.

The tapes, recorded between 1989 and 1991, feature 12 unreleased tracks, including one labeled “Truth on Youth,” described as a “duet rap with LL COOL J.”

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