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Prince

Scheme: Prince was a “surprise” performer on the 2006 finale of “American Idol.” How it worked: To promote last year’s album “3121,” Prince stooped to performing on “American Idol,” which may be a highly entertaining karaoke show, but it’s still a karaoke show. Although it generated press and inspired debates about the use of “American Idol” as a marketing tool, chances are you still don’t own “3121.” Kevork Djansezian / AP
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