In March 2009, the Wonder Girls confirmed that the group would launch in an English-language music career in the United States with the official release of an English version of "Nobody" in summer 2009. It was later announced that the release would be followed by an English version of "Tell Me", and that an English album would be forthcoming. In June 2009, JYP Entertainment announced that the Wonder Girls would be joining the Jonas Brothers on the North American leg of the Jonas Brothers World Tour 2009. In order to concentrate on their American debut, both Sohee and Sunmi had dropped out of high school. The English version of "Nobody" was released on June 26, 2009, the day before the start of their tour with the Jonas Brothers. The Wonder Girls were initially signed on for 13 concert dates across the US, but they were eventually given the opportunity to join the Jonas Brothers for a total of 45 concert dates. "Nobody" entered the "Billboard" Hot 100 in October 2009, making them the first Korean group to enter the chart. The song also topped the Taiwan and Hong Kong music charts.