"Incomplete" is a song by American vocal group Backstreet Boys from their comeback album, Never Gone. The power ballad was released in April 2005 as the group's first single since they decided to reunite after a three year hiatus. It was written by Dan Muckala, Lindy Robbins, and Jess Cates, and it was produced by Muckala. The song became one of their most successful singles, peaking at number thirteen on the US Billboard Hot 100, and charting within the top 10 of thirteen countries. It debuted at number one in Australia, becoming their first number-one hit in the country. The song has sold 250,000 units worldwide, which earned it gold certification. In the US, it was their last successful single of the 2000s, as the song still receives airplay on fewer adult contemporary radio stations in the United States and Canada. To many, this was the Backstreet Boys' final mainstream hit.