Japandroids, a couple of Canadians who live to bash out invigorating adolescent punk anthems, come to The Summit, 2210 Summit St., tonight at 9. My preview explains why these guys are better than your average wistful distortion junkies. Joining them will be Mt. St. Helens Vietnam Band, a strange family band of sorts from Seattle who are better heard than described. This excellent double bill will cost you $8 in advance and $10 at the door.