f(x)'s Amber dropped a surprise collab track titled "Breath Again"!

The song appears to be a collaboration between Ksuke and Amber, and it's a pretty sick track that is an infusion of house and dubstep. "Breathe Again" starts out melodically with a keyboard-based tune but builds into a chorus with a dubstep breakdown. Amber's clean, slightly husky vocals are the perfect addition to the track, making for a catchy, fun listen. The idol even drops a couple rap verses near the end, so be sure to listen to the track in its entirety!