Is there an mp3 file of the music box version of the song 'julia' from cowboy bebop?

In the episode entilted "Jupiter Jazz" in the anime series cowboy bebop, there is a music box owned by vicious that plays the song "julia" aka "Goodnight Julia" and i figure since it was written for an anime there has to be a track for that version somewhere, but all i can find is the version played on the saxophone dose anyone know where i can find the music box version< or if it even exists in an mp3 format?