"Arty is a dope producer so I wrote this song to 'Rebound' this last year," he said. "I got in touch with Arty and showed it to him, did a different version to it 'cause I asked him [to] make it newer 'cause I don't just wanna take your song and rap over it."
But he said that after a year's time, "we preferred writing over and using the [original] rebound. Something happened and the clearance... hopefully we resolved the issue."
Arty claimed in Twitter posts on April 16 that no one from will.i.am's team had worked out a deal for the tracks through his label, Anjunabeats. "Let's Go" was uploaded to will's YouTube account on April 16, and has over 750,000 views and 14,000-plus comments already, many of them negative.
"He finally admitted it. On the day the album is released, of course. Go write this thief a review on iTunes," wrote "riotistx" in one of the video's top comments.
"Let's Go" is the fifth track off will.i.am's fourth studio album, "#willpower," out today. Arty and Mat Zo's "Rebound" was released in April 2011.