Madi Diaz. (Photo by Elizabeth Weinberg)

B.o.B featuring Andre 3000: “Play the Guitar”

Remember when Three Stacks almost never did features, preferring to remain a figure of (semi-) mystery? Those days are long gone. Here, he classes up a track from B.o.B’s upcoming “Strange Clouds,” produced by longtime Amy Winehouse cohort Salaam Remi.

Gods’Illa featuring Bahamadia, Monie Love, MC Lyte and Maimouna Youssef: “You Don’t Have to Be a Star” (remix)

Having erected one of their best songs around a sample of the same-named ’70s classic, the DMV threesome enlist some of the greatest femcees of the ’80s and ’90s for this killer retake.

The xx: “Open Eyes” (demo)

Consider this spartan, melancholy demo a teaser for the British group’s new disc, the long-awaited follow-up to its ’09 breakthrough disc.

Madi Diaz: “Trust Fall” (Down We Go remix by Jensen Sportag)

The 1980s corporate bonding exercise finally gets the tribute it deserves, plus a fittingly nostalgic R&B-inspired remix.

Polica featuring Mike Noyce: “Lay Your Cards Out”

The Minneapolis newcomers team with Bon Iver/Gayngs guitarist Noyce for this effortless early winter jam.