br After six years Christina Aguilera has made her music comeback. The singer release a new single, “Accelerate” on Thursday. Christina also announced her long-awaited studio album “Liberation” will drop June 15. Between albums, Christina has stayed busy serving as a coach on “The Voice” alongside Adam Levine and Blake Shelton. While “The Voice” continues to be a hit on NBC, Christina has revealed that she’s done with the show.