Electro-Pop: Matmos released their new record, Supreme Balloon, to acclaim back on May 6. The Baltimore-based pop/electronica duo have moved away from the conceptual electronic compositions of their earlier work and deliver a record of "cosmic pop" deliciousness. Check out the song "Rainbow Flag" [mp3] here, and check out the band down at the Triple Door tonight. 8 p.m. // 216 Union St. // $20 (+ don't forget about the Triple Door's seating policy) Guilty......