Now, the mouse-headed producer has Diplo and Skrillex super-group, Jack Ü, in his sights, taking aim at their Justin Bieber-featuring hit, "Where Are Ü Now."

Deadmau5 used his Soundcloud account to release "where im at," an obvious swipe at the Jack Ü track. Utilizing a similar bass sound and trap beat, Deadmau5 emulates the warped flute hook of "Where Are Ü Now" with what sounds like a kiddie harmonica wheezing out of key.