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Watch! Rachel, Mercedes, Santana and Kurt Sing Whitney Houston's "How Will I Know" in Glee Season 3, Episode 17: “Dance With Somebody” (VIDEO)

Rachel (Lea Michele), Santana (Naya Rivera), Mercedes (Amber Riley) and Kurt (Chris Colfer) sing a gorgeous acapella version of Whitney's classic "How Will I Know" in Season 3, Episode 17: “Dance With Somebody.” 

Original airdate: Tuesday, April 24 at 8pm on Fox

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