Canadian Celtic-rock band Great Big Sea will perform at 8 p.m. tonight at the Byham Theater, 101 Sixth St. Tickets are $30 and $35 and are available now by calling 412-456-6666 or at the Box Office at Theater Square, 655 Penn Ave.

Calliope: The Pittsburgh Folk Music Society will host a performance by Blues at the Crossroads at 7:30 p.m. Wednesday; doors open at 7 p.m. at the PIttsburgh Center for the Arts, 6300 Fifth Ave. Admission is $40. Call 412-394-3353 for tickets or 412-361-1915.