The British dance-punk band Bloc Party helped make club music safe for young rock fans in the 2000s. Yet Bloc Party shed most of its pioneering club influences on its new album, "Four," a fanged and heavy record that focuses on live musicianship and ferocious guitar work. The Observatory, 3503 S. Harbor Blvd., Santa Ana. 8 p.m. Sat. $35. http://www.observatoryoc.com.