Don't Stop Believin'

"Don't Stop Believin'" is a popular song by the American rock band Journey, originally released as a single from their 1981 album Escape, which became a #9 hit on the Billboard Hot 100 on its original release. In the United Kingdom, the song was not a Top 40 hit on its original release; however, it did reach #6 on a 2009 re-release, having gained increased popularity through its use on television.

Source: Wikipedia