Brooklyn folkie Langhorne Slim strips American music down to just the bare essentials: an acoustic guitar and a singer/songwriter with a little bit of fire and a whole lot of personality. A favorite of the music blogosphere, Slim does a 9 p.m. show at Mad Planet tonight with openers Atlatl, a young Milwaukee group that teeters back and forth between harmonic jam-rock and ramshackle indie-rock.
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