Of Mice & Men treated fans yesterday with the release of their new single "Unbreakable," which marks their first track since frontman Austin Carlile's departure. The band premiered the song on BBC Radio 1's Rock Show with Daniel P Carter. Bassist Aaron Pauley is now taking lead as vocals, and drives the intensity of the new single over the edge.

Carlile announced that he would be leaving Of Mice & Men in December. "The band will now still continue on just the four of them, and I wish them the best of luck without me heading into 2017," he said in a Twitter statement. “I will be here in Costa Rica, where I have now moved, continuing to heal, rest, and write. I will not stop playing music, I am still able to sing and I’m hungry for what is next to come even though I have no idea what that may be.”

Prior to his decision, the band canceled the rest of their fall European tour in order to focus on Carlile's health. They explained to fans they had to "cut short our set in Portsmouth on Saturday night due to Austin being in pain throughout the show." The news comes after Carlile revealed he suffered a collapsed lung in the middle of Denver concert last August. 

"I couldn't breathe right and I was gasping. I managed to do the rest of the show. Then the medics came and gave me oxygen and the lung somehow kind of naturally re-inflated," he said. "The best laid plans for Of Mice and Men often go awry. I can't plan for much because I feel like life is always going to throw me a curve ball." The singer suffers from fibrostic connective tissue disorder called Marfan Syndrome.

Below, watch Of Mice & Men tell us about touring with Marilyn Manson and Slipknot at the 2016 APMAs: