Tick, Tick ... Boom! Thin but engaging, this autobiographical musical by Rent composer Jonathon Larson is an all-singing-and-dancing portrait of the artist hitting 30 and feeling sorry for himself. The story is insular, and not all the songs register, but fine performances elevate everything. As Jon, John-Michael Zuerlein brings a shrugging charisma to a character that could seem self-involved, and Sarah Crawford and Tim Scott shine as a host of supporting characters. And the band comes as close as musical theater can to actually rocking without sounding like Meat Loaf. It's all proof that, with time, experience and a willingness to seek inspiration outside his own life, Larson might have been as great as Rent fans proclaim him. Through July 16 at the Unicorn Theatre, 3828 Main, 816-531-7529, ext. 10. Reviewed in our June 22 issue.