Built by local musicians, staffed by local musicians, owned by local musicians, Sonic Boom is the sound of Seattle. While their selection of national and international CDs and vinyl records stands up to that of any big chain’s, it’s their presence in the local scene that makes Sonic Boom one of the city’s most beloved shops. From experimental electronica made on Capitol Hill to spacey Brit pop to reissues of old Johnny Cash classics, they’ve got it.