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Chief Keef -- Sat, 12:15 p.m. Earlier this month, during the final sets of Pitchfork Music Festival, Arabmuzik was impressing with his rapidfire MPC drumming and out-there live beats, when Chief Keef -- a 16-year-old Chicago rapper with a recent major-label deal -- made a surprise appearance on stage for two songs, bringing his massive crew with him: an undeniable highlight of the weekend. Keef is one of the biggest names in Chicago hip-hop at the moment, but has performed few hometown shows, so his Lolla set is definitely one to catch.