In these black days it's mighty difficult to find music that will piss off parents. If anything should make mom or dad cringe, it's heavy metal. But bust out some Black Sabbath and there's a good chance Pops will turn it up to eleven and tell you how he saw 'em in '77 at a San Francisco show where he tripped on Mr. Natural blotter. Fortunately for the young and angst-ridden, Cavity goes one step beyond metal. Heavy and sonically unearthly, their feedback alone will shatter the eardrums of anyone over age 35. This year, in an homage to one of the bands that started it all, Cavity laid down a searing version of "Into the Void" for Hydra Head Records' In These Black Days, a double seven-inch tribute to Sabbath. See what Dad thinks of that.