Canadian spunk rock trio Born Ruffians first made waves in earnest with their "Knife" cover last year and were so opening for Peter Bjorn & John at their second Stateside gig at Merc in January. Something's shifted since then -- the band's jerky, interval-jumping riff rock's coalesced into something sound-defining and utterly addictive, evinced on their undeniable "Hummingbird"/"Kurt Vonnegut" single. ...