The singer says I look back on Venus, I look back on Mars, I burn with the fire of 10 million stars...?

I was listening to some songs on iTunes, and this song started to play. It closes the movie, and starts with the orchestra opening the song followed by a singer then dancers and an electric guitar followed by the entire ensemble. It may be the best ensemble in modern motion pictures and I do not believe that the song or the motion picture ever got the credit it was due. The cast was stellar, with unknowns, and few star quality actors and actresses. Name the song and the movie.