Yasiin Bey slips into “Umi Says” mode on Petite Noir’s “Till We Ghosts.” More than just a featured appearance, Bey (formerly Mos Def) takes over at 1 minute in and closes out the ambient, string-driven track. He progresses from meditative verse to plaintive wail. This is the kind of free form, genre-bending music that brings out the best in Bey. Check it out.

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