In Bieber's second album, because of puberty, his voice was deeper than it was in his first album.In April 2010, the singer discussing his vocals remarked, "It cracks. Like every teenage boy, I'm dealing with it and I have the best vocal coach in the world. Some of the notes I hit on "Baby" I can't hit any more. We have to lower the key when I sing live. Bieber guest-starred in the season premiere of the CBS crime drama CSI: Crime Scene Investigation, which aired on September 23, 2010. He played a "troubled teen who is faced with a difficult decision regarding his only brother", who is also a serial bomber. Bieber was also in a subsequent episode which aired on February 17, 2011, in which his character is killed. Bieber performed a medley of "U Smile", "Baby", and "Somebody to Love" and briefly played the drums at the 2010 MTV Video Music Awards on September 12, 2010. Bieber announced in October 2010 that he would be releasing an acoustic album, called My Worlds Acoustic. It was released on November 26, 2010 in the United States and featured acoustic versions of songs from his previous albums, and accompanied the release of a new song titled "Pray".