"Baby", the lead single from the second half of his debut album, which featured Ludacris, was released in January 2010 and became his biggest hit thus far, charting at number five in the U.S. and reaching the top ten in seven other countries. Two digital singles, "Never Let You Go", and "U Smile" were top thirty hits on the U.S. Hot 100, and top twenty hits in Canada. According to review aggregator Metacritic, the album has received "generally favorable reviews". It debuted at number one on the U.S. Billboard 200, making Bieber the youngest solo male act to top the chart since Stevie Wonder in 1963. My World 2.0 also debuted at number one on the Canadian Albums Chart, Irish Albums Chart, and Australian Albums Chart, and the New Zealand Albums Chart and reached the top ten of fifteen other countries. To promote the album, Bieber appeared on several live programs including The View, the 2010 Kids Choice Awards, Nightline, The Late Show with David Letterman, The Dome and 106 and Park. On April 10, 2010, Bieber was the musical guest on Saturday Night Live.
Bieber will begin recording his next album in the summer of 2010 in New York City. British singer and songwriter Taio Cruz has confirmed he is writing on Bieber's next project.
Bieber's voice is now deeper than it was when he recorded his albums because of puberty. 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 anymore. We have to lower the key when I sing live."