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VOICE OVER: Phoebe de Jeu WRITTEN BY: Arianna Wechter When music superstars heard their hits covered on "Glee," reactions ranged from thrilled to furious! Join MsMojo as we count down the most iconic musician reactions to their songs being performed on the hit show. From Amy Winehouse's surprising fandom to Prince's scathing criticism, these celebs didn't hold back their true feelings! Our countdown includes reactions from Katy Perry's tearful joy over "Teenage Dream," Jonathan Coulton's anger at the unauthorized "Baby Got Back," Paul McCartney's fan letter to the show's creators, Slash's harsh comparison to "Grease," and Florence Welch's delight at her "amazing Christmas present." Which celeb reaction surprised you most? Let us know in the comments below! read more...