American singer and songwriter Bonnie McKee has co-written eight number-one singles, which have sold more than 30 million copies worldwide combined. Her debut album Trouble was released in September 2004. She singlehandedly wrote all but one song on the album, some when she was 14 and 15 years old. A standalone single, "American Girl," was released in 2013. An album was due for release in spring of 2014 but, by the end of the year, had not yet materialized. Instead, an EP, Bombastic was released in June 2015.