Would you believe it's from "Showboat"? (Who'da thunk it?) :lol:
The piece is called "Natchez", and is track 3 on the soundtrack of the 1951 film. While Amazon has all the tracks available for preview, the preview for this track is from a part that doesn't really sound at all like what we know.
Luckily, I happen to have that soundtrack in my CD collection. Here's the track:
http://webpages.charter.net/steerr/Natchez.mp3
(Right-click and do "save as", I couldn't get it to play in my browser just by clicking the link) The part that we all know and love starts at the 41-second mark. (It just brings me right back to GMR listening to it...)
Obviously Disney re-orchestrated and recorded all the music specifically for the attraction.
Other people were talking about Scott Joplin, and yes, the montage does start out with his piece "The Entertainer".
Watching a video of the finale on YouTube, here's what I've got for music:
(also note that because they orchestrated it and recorded it themsevles, not every bit of music is specifically from a movie, some might have been written to bridge pieces together)
-"The Entertainer" by Scott Joplin
-"Natchez" from Showboat
-?????? (Unknown slapstick comedy section)
-"Axel F" from Beverly Hills Cop
-?????? (Action sequence)
-Random fanfare
-"Dance of the Hours" originally from the ballet La Gioconda by Pochielli, but better known from Fantasia.
-"Tara's Theme" from Gone with the Wind
-Main Theme from Star Wars
Can anyone fill in the missing pieces?
-Rob