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In terms of inventive, catchy metaphors, huge lead single "Umbrella" may be the worst thing since 50 Cent's "Candy Shop," but generally that's what constitutes a hit: simple Girl Scout images. Timbaland submits three standout tracks, including the Justin Timberlake– assisted "Rehab," full of jingling bells and a rumbling synth pattern. Not all is dandy elsewhere—the cheesy aerobics workout "Don't Stop the Music" belongs at a Bat Mitzvah, and "Push Up on Me" is a so-so come-on that displays more hormones than talent. But Good Girl's finest moment comes last, on the title track, wherein Rihanna explores her idea of a bad girl in detail: "All he do is keep me at home/Won't let me go nowhere/He thinks that because I'm at home I won't be getting it on." None of this is convincing, but if nothing else, she's the hardest-working marginally talented artist out there.