New York musician and performance artist John Kelly impersonates Joni Mitchell in the same way someone who dresses in white and jumps a motorcycle over the Grand Canyon impersonates Evel Knievel—by re-creating his subject's amazing accomplishments before our eyes. Kelly's got his Mitchell down, from her alto coos and trills to her twisty chords and time signatures. The only thing keeping it from being overwhelmingly uncanny is the loving, hilarious winks Kelly slips into his otherwise pristine embodiment. (Triple Door, 216 Union St, 838-4333. 8 pm, $22 adv/$25 DOS, all ages.)