Gonna Fly Now made by Carol Connors, Bill Conti, Ayn Robbins. Text of the song is almost not at all, but this song is so active that, right from the action movie shot place, has made the owner of image of Rocky Balboa – Sylvester Stallone – famous. Well, perhaps not only the song itself, but it served as a considerable service that in the trailer for the film sounded exactly fitting the mood of the film. And this song is for a winner.
Reference:"Gonna Fly Now" - Wikipedia
Gonna Fly Now lyrics - Carol Connors, Bill Conti, Ayn Robbins