Here's why:
* Copyright: As the composer, John Williams initially held the copyright to the music. However, when he was hired to score the film, he likely assigned those rights to Universal Pictures as part of his work-for-hire agreement.
* Work-for-hire: In a work-for-hire arrangement, the rights to a creative work created by an employee or contractor are typically owned by the employer or commissioner.
Therefore, while John Williams created the music, Universal Pictures owns the rights to use, reproduce, and distribute the Jaws theme song.