On '' My World 2.0 '' , Bieber 's voice was noted to be deeper than it was in his debut EP , due to puberty . In April 2010 , the singer remarked regarding his vocals : " 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 ca n't hit any more . We have to lower the key when I sing live . " Bieber guest-starred in the season premiere of the CBS American 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 of the series , which aired on February 17 , 2011 , in which his character is killed . Bieber performed a medley of his singles " 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 "
2010 MTV Video Music Awards
2010 MTV Video Music Awards
Justin Bieber