Ponytail's Molly Siegel explodes like a vigorously shaken can of pop let loose all over the stage. Her ecstatic shouts and whirs - she usually avoids singing actual words - punctuate the virtuosic two-guitar-and-drum attack of her band mates. But the group's intricate guitar work isn't without soul. The Baltimore band's latest record, 2008's "Ice Cream Spiritual," bursts with proggy major chords, summer fun and incomparable joie de vivre. The riffs only up the tension-filled ante. Ponytail is paired on this tour with Yeasayer, a Brooklyn band that fuses jammy riffs and mystic world music. Phantogram also performs.

The show takes place Wednesday, July 15, 8 p.m. at Bug Jar, 219 Monroe Ave. $10-$12. 454-2966.