I don't know from the top of my head how long the soundtrack is at the moment, but one minute of music is one MB of file space needed. The only possibility would be to upload one track per week / month, deleting the previous and go on till you got all ten tracks.
just in case you're considering it, i could easily live with that restriction if your bandwidth could deal with it. not sure if it would make it easier on the bandwidth, but perhaps put it up in "many small chunks"?
Oh, and if download traffic reaches a certain limit, web space prices will rise as well. And judging from the number of people who already downloaded the mp3s, this would be quite a huge amount of traffic.
remind me to talk offline about this. some ideas that might/maybeish help. cheers brendan