Bill Russell and Henry Krieger's 1997 Broadway show isn't so much a musical as a series of scenes in which the characters meditate in song about their feelings or fret about what they're going to do next. That Side Show focuses on two conjoined twins (loosely based on the historical Hilton sisters) and their sometime business managers/maybe lovers doesn't make the experience any livelier. What does help this morbidly introverted show is Stephen M. Genovese's intensely intimate Bohemian Theatre Ensemble staging, which features nearly perfect performances by a mostly non-Equity cast. Vanessa Panerosa and Andrea Prestinario as the twins and Aaron Holland as their love-struck personal assistant are adept at finding emotional depth in the shallow, mildly campy material. Through 7/9: Thu-Fri 8 PM, Sat 5 and 9 PM, Sun 6 PM, Theatre Building Chicago, 1225 W. Belmont, 773-327-5252, $20-$25.