Norwegian Arms , the Philly freak-folk outfit led by Keith Birthday, a.k.a. Brendan Mulvihill, and trusty partner in crime Dr. Awkward, a.k.a. Eric Slick of Dr. Dog, with occasional help from other talented buddies like Dominic Angelella and Andy Molholt, will be opening for Architecture in Helsinki and Hooray for Earth at World Café Live tonight. The project began when Mulvihill, one of the founders of the beloved DIY space the OX, moved to Tomsk, Russia after receiving a fellowship to teach English. An old mandolin was the only musical instrument that made the journey with Mulvihill, which became a catalyst in Norwegian Arms’ unique sound. Nowadays, many “folk” bands are turning electric, but Norwegian Arms stick to a minimalist combination of acoustic mandolin and rhythmically intricate percussion. Mulvihill and company are offering their latest EP, Trimmings Of Hides, for free download HERE so you have no excuse not to join in the folky sing-along this evening. They are also working on a new full-length planned for release in 2012 so you may get a taste of it too. World Café Live, 3025 Walnut Street, $15, 7pm, All Ages – Dan Brightcliffe