Listen to Main Theme (From “Once Upon a Time in America") online. Main Theme (From “Once Upon a Time in America") is an English language song and is sung by The City Of Prague Philharmonic Orchestra. Main Theme (From “Once Upon a Time in America"), from the album 100 Greatest Film Themes Take 2 (100 Greatest Film Themes - Take 2), was released in the year 2010. The duration of the song is 2:10. Download English songs online from JioSaavn.