Composing : Need help with score for a short film... by Stephan Barker

I found the perfect song. Was digging through my classical music and knew I would find something. And I did. I works perfectly. Bartok Piano Concerto No 1-1 Allegro. Google it to confirm. ARGH! "This work likely not be in the public domain"! Béla Bartók died in 1945. Plus 70 years before it enters public domain (as far as I know) - that's 2015! Darn it! So now I need your help. It is for a short film. The entire film is probably 10 minutes long. The intro is quite long where there is no dialogue. We need suspense music, with a slight build up. If anyone can help or know of a similar song that is in public domain, please let me know. Unfortunately I cannot pay for it, since we are working on a zero budget. Please feel free to inbox me if you would like more details. Thanks.