APRIL VERCH BAND The latest in the consistently interesting Backroom Series of shows features the April Verch Band, fronted by the titular Canadian’s triple-threat combination: She’s a virtuosic fiddler in various North American roots styles, a singer with a high-pitched, gossamer trill of a voice, and an accomplished stepdancer. April 22, 7:30 p.m. Tickets: $23. The Burren, Somerville. 800- 838-3006.