But Will confessed that he would do it all again with another artist he thought deserved to work with him.
"Yeah, hell yeah," 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. John Legend folders.
"We record songs and write songs and to get one song you have to record seven songs. 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.
"There's Michael Jackson folders, there's Whitney Houston folders, there's a Mariah Carey folder… They're just going to sit there on my hard drive. Somebody has to go through them."
Source: Digitalspy