Garbage singer Shirley Manson makes for a great rock star at a time when such a commodity is rare. She's brassy, confident, self-consciously provocative, and enigmatic -- and her industrial-strength pipes can dart with ease from tough-chick bluster to girlish fragility. But her surface appeal, and her mates' production dazzle, has sometimes camouflaged the fact that as a lyricist, she readily settles for the easy cliché.