Before Stanley Kubrick made the decision to use classical music for 2001: A Space Odyssey‘s soundtrack, he hired composer Alex North to create original music for the movie’s opening. In typical Kubrick style, he cut North’s entire score in postproduction and replaced it with the classical soundtrack we know 2001 for today.

40 minutes of Alex North’s intended score can be heard over at rdio. The video up above was created by YouTube user Robert Beardsley and is an edit of the intro to North’s music. It’s not spot-on perfect, but it does give you an idea of what 2001: A Space Odyssey could’ve been — a drastically different movie.

(via io9)