LONDON, UNITED KINGDOM - MARCH 11: Will.i.am visits The Science Museum where he announced The Prince's Trust new STEM (Scienc
Stuart Wilson

Will.i.am premiered his star-studded fourth album #willpower yesterday, and fans across the globe went nuts for new tracks featuring everyone from Miley Cyrus to K-pop phenoms 2NE1, to an 8-year old rapper named Baby Kaely. But fans of EDM were pissed when the Black Eyed Pea dropped "Let's Go," his new collabo with Chris Brown

The chorus features a fist-pumping, euphoric dance beat as the duo sing, "Let's get crazy, all right! C'mon let's go!" But Russian trance DJ/producer Arty and London-bred house producer Mat Zo are calling foul.

The duo claim the "Let's Go" lead in and chorus is lifted from their 2011 dance track "Rebound." Arty responded to the controversy on his Twitter account, writing that neither Will.i.am nor Brown "cleared rights through Anjunabeats, who's only one label, who ownes [sic] the rights for 'Rebound.'"

Meanwhile, Zo took to his Facebook page to write the two words an artist never wants to hear: copyright infringement. 

"I really and truely [sic] appreciate all the support you are giving me and Arty in response to Will I Am's copyright infringement," he wrote, addressing his fans who lambasted both Will.i.am and Brown online. "However, this doesn't excuse the horrific abuse you're sending the way of Will I Am and Chris Brown."

But is the Black Eyed Peas frontman guilty of copyright infringement? Listen to the two songs below and decide for yourself.

Will.i.am & Chris Brown's "Let's Go"

Arty & Mat Zo's "Rebound"