Photo of will.i.am by Astrid Stawiarz

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will.i.am says he's sitting on "folders" of unfinished material from some mega-names such as Michael Jackson, Whitney Houston, Beyoncé, Britney Spears and Rihanna.

“I got a hard drive full of songs that just sit there and we could go through them,” the Black Eyed Peas ringleader said this week while promoting the current season of The Voice UK, on which he's a judge.

"When I work with artists, we record songs and write songs, and to get one song you have to record seven," will said, while suggesting contestants he works with on the singing competition might eventually have access to "go through the hard drive."

Claiming he's the guy "they always call," will.i.am explained that he has too much unheard material to sift through himself. "They're just going to sit there on my hard drive," he said. "Somebody has to go through them."