Anyone know how to get a copy of the music?

Does anyone out there know where I can find a recording of the musical score to this film? Ralph Rainger's composition, originally called "Radio Dynamics," is as stunning as the images Oskar Fischinger cooked up for it. It's pretty obviously influenced by George Gershwin's "Rhapsody in Blue" but it's quite good in its own right and I'd really like to have a record of it!