Last night, on an Afropunk-curated bill that also included Cakes Da Killa and Princess Nokia, smooth-voiced singer SZA performed at Rough Trade in the Williamsburg neighborhood of Brooklyn. In a surprise move, she pulled tiny grown-up Willow Smith on stage to sing an unreleased R&B-sounding collaboration called "Domino." Watch a video of the low-key duet above, captured by Scene Media; "can I tell you she's cooking some of the craziest shit I have ever heard?" SZA says at the end of the clip. The 13-year-old singer is set to appear alongside SZA on Kitty Cash's upcoming Love The Free II mixtape, which also includes contributions by lots of artists we like: Wet, Rochelle Jordan, Empress Of, Dev Hynes, among others. Side note: is it just me or did "Summer Fling" kind of age well? Just a couple months but we do it anyway, we do it anyway…