Who Is Thelma Houston And Why Was She On 'American Idol'?

Singer performed her #1 hit 'Don't Leave Me This Way.'By Gil Kaufman Thelma Houston in the 1970's Photo: Michael Ochs Archives/ Getty Images While Harry "KC" Wayne Casey pretty much phoned in his performance of KC and the Sunshine Band's "Get Down Tonight" on Wednesday night's "American Idol" results show, fellow disco sensation Thelma Houston proved why, more than 30 years after her commercial peak, she still has it. Houston, 65, born Thelma Jackson in Leland, Mississippi, performed...

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