Every now and then, a ferocious little band comes along to reteach the old punk-rock lessons: 1) Less is more; 2) Short, sharp and shouty is great; 3) And a toy guitar, played with little skill, can kick as much ass as a real one. Meet Micachu and the Shapes, a U.K. trio helmed by the owner of that tiny toy acoustic, 21-year-old Mica Levi. The 13 songs here average just 2:30 in length, but they cram a lot in: raggedy strumming, clanking percussion and a symphony of squeaks and buzzes courtesy of producer/electronica whiz Matthew Herbert. But the guiding force is Levi — an instant punk heroine, thanks to that adorable guitar.