Will.i.am has unreleased songs by Michael Jackson and Britney
The musician and producer told Digital Spy that he has folders of music that never made the final cut.
Also in the US star's treasure trove of unreleased songs are the likes of Whitney Houston and Mariah Carey.
He said: "I got a hard drive full of songs that just sit there and we could go through them.
"There's Nicole Scherzinger folders, there's Britney folders, there's Rihanna folders, Beyoncé folders - just songs.
"When I work with artists, we record songs and write songs, and to get one song you have to record seven.
"So those other six are actually really good. Maybe there's two of them that are good, maybe there's one lingering one that just needs some touching up.
"So you just go through the hard drive. There's Michael Jackson folders, there's Whitney Houston folders, there's a Mariah Carey folder."
He added: "Because I get called to - I'm like the person they call. 'We want something different, we're looking for something different, we need an international song'. So they always call.
"Me and my squad of writers. So yeah. They're just going to sit there on my hard drive. Somebody has to go through them."
Watch Will.i.am in action below:
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