<strong>TURISAS Just the thing to get you fired up for Beltane! Paganfest 2012 headliners Turisas parlay a mashup of Symphonic metal, Queen-like bombast and Finnish folklore into a blood-spurting but ultimately uplifting Dark Age saga. Unlike many Battle Metaleers, frontman Matthais Nygard shuns growling for a sepulchral Peter Murphy croon that verges on Broadway show tunes. The alternately chugging and soaring backup is so committed to the bardic songs about voyaging, plundering and pillaging, that they never topple into full-on GWAR absurdity. Think Jim "Bat Out of Hell" Steinman meets Disney's "Pirates of the Caribbean" ride - but with Vikings. Fellow blood and thunder acolytes Alestorm, Arkona, Huntress and Aether Realm help stoke the flames of Balor. $20-$23. Tremont Music Hall.