The filmmaker told journalists at Comic-Con that Daft Punk, who are working on the score for the Disney sequel, that the duo's work is "blurring the lines between sound design and music".
He said: "I've been working with Daft Punk for almost three years on this film. It's a new direction for them, it's a combination of orchestral, electronic and granulate sound. It blurs the line between sound design and music.
"Because we started so early I was able to play tracks on set to get actors in the mood. I think that the picture and the music are so integral to each other it's really exciting to see."
Tron Legacy opens in 3D, IMAX and conventional cinemas on December 26.
> At The Movies: Joseph Kosinski chats 'Tron Legacy'