The freestyle was originally recorded in 1999.
Earlier this week, radio host Tim Westwood shared an unreleased freestyle between Eminem and the late rapper Proof.
On Monday (May 27), Westwood uploaded the 20-year-old freestyle featuring to the official Tim Westwood TV YouTube channel. The freestyle lasts nearly eight minutes as the emcees trade verses, bars, and laughs.
The video comes as a delightful surprise to D12 and Em fans, and as a reminder of the Detroit rappers' personal and professional relationship.
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Westwood unleashed another freestyle showcasing Proof and Em’s skills in 2016, which was also recorded in 1999.
The freestyle was released in tandem with the 10-year anniversary of their Westwood freestyle.
Proof was shot and killed in Detroit in 2006.
Listen to the freestyle above and revisit the rappers' Westwood freestyle below.