An unexpected drop-in from The Abstract.

Roc Marciano has shared a clip from a recent performance at NYC's Sony Hall, featuring an unannounced cameo from Q-Tip.

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Crashing the stage during "Congo," a standout selection from Roc's 2018 album, Behold a Dark Horse, (which featured production from Tip on "Consigliere,") The Abstract played overqualified hypeman to the Long Island rapper's brooding, dozens-deep show, ramping up the hometown crowd as Roc belted out his lines

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The performance capped a stellar year for both rappers. Roc's latest studio project, Marcielago, arrived just weeks back, while the elder Tribesman was at the helm of Danny Brown's crtically-lauded, Uknowhatimsayin, producing three songs on the album.

Watch Q-Tip join Roc Marciano for an electric performance of "Congo" below.