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Paul McCartney's theme to the new video game "Destiny" is getting a life of its own. says the song, called "Hope For The Future," is being released as a single. 

McCartney co-wrote "Destiny's" optimistic anthem, and recorded the track at Abbey Road studio.  He's backed by a 120-piece orchestra on the epic, six-minute-and-39-second piece, which Bungie's Community Manager Eric Osbourne says the rock legend did for free. 

Many have assumed the company forked over a hefty sum for the work, but Osbourne tells "there was no check involved, big or otherwise."  He explains that the former Beatle was "in it for the creativity," and to "reach an audience that wouldn't typically be immersed in Paul McCartney." 

Sir Paul also contributed to the game's soundtrack.  "Hope For The Future" is heard as the game's end credits roll.  

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