Punch Brothers

Bluegrass groups – either traditional bands or ones that promise to fuck things up by adding a little punk to the mix – aren't all that rare these days. Lots of reformed alt-country artists, or maybe it's just guys who can't pay their electric bills, are making music with unplugged banjos, mandolins, and acoustic guitars. But few do it as well as the Punch Brothers, who have the bonus brawn of being terrific musicians. Led by Chris Thile -- who used to front Nickel Creek, which arguably started the whole bluegrass revival way back in the early '90s when he was in his teens – the quintet sounds positively forward-looking on their recently released third album, Who's Feeling Young Now? The centerpiece is a sprawling cover of Radiohead's complicated “Kid A,” which the Punch Brothers manage to make even more complex with their screechy fiddles, pulled mandolin strings, and violent guitar thuds. Their original material is tangled too, hurling bluegrass into the 21st century in ways those cowpunks never dreamed. 8 p.m. Tickets: $22, $20 in advance. –Michael Gallucci