Before she passed, Whitney Houston recorded a duet with R. Kelly called 'I Look to You,' which has just been released.

Recording industry vet Clive Davis, who discovered Houston, called into 'On Air With Ryan Seacreast' on Tuesday, (Sept. 25), to unveil the unreleased exclusive track, which will appear on the upcoming album 'I Will Always Love You: The Best of Whitney Houston.'

"She went into a studio by herself in Los Angeles and recorded two verses and a chorus of the song ‘I Look to You,’ which R. Kelly had written for her and for our album," Davis told Seacrest. "I was just knocked out by it. To hear Whitney, as Whitney again, to hear her, the full flower of her voice it really showed the potential when she was ready to record again."

The emotional song ends with a special message from Kelly. He says, "We love you, Whitney. Rest in peace." The tune also has a special place in many hearts, as Davis asked the R&B star to sing the moving duet at Houston's funeral. He performed it with a choir, and, Davis said, "There was not a dry eye in the house."

'I Look to You' is available on iTunes now.