Thanks to DLP.info's news article about the Michael Giacchino special on the Cinematic Sound program on C101.5 FM in Hamilton, Ontario (See it here!), we can now listen to the soundtracks of the Paris, California and Hong Kong Space Mountains, as well as California and Hong Kong's queue music.
The 3 hour special is available online as 3 seperate streming files of 1 hour each. All the Space Mountain music is in the 2nd hour file.
I have downloaded the relevant parts and have cut it into three MP3's for you to download if you wish:
Califronia/HK's onride soundtrack, including disembarkation music at the end.
California/HK's queue area music.
Paris' Mission 2 soundtrack, starting from the canon launch.
Please note that the HKDL Space Mountain soundtrack is identical to California's, except that the countdown at the top of the lifthill is omitted.