Was it one of these?
http://www.imdb.com/title/tt0280665/soundtrack
eta Maybe look this one up.
"Le Carnaval des Animaux"
(1886)
Written by Camille Saint-Saëns
© Éditions Durand
Courtesy of BMG Music Vision
Published by Carlin / K Musik
Try this one. My guess is #7 at about the 8:30 mark, The Aquarium.
http://www.youtube.com/watch?v=hjaBGAfWGSU
Found a more concise version. If this is it.
Try this one first.
http://www.youtube.com/watch?v=_uORFkc-wRc&NR=1&feature=fvwp
eta Is it on this list from Epcot?
http://allears.net/tp/ep/e_fran2.htm
Concerto for Harp and Orchestra by Francois-Adrien Boieldieu
Claire de Lune (orchestral arrangment) by Claude Debussy
Nocturne No 1 (Nuages) and Nocturne No 3 (Sirenes) by Claude Debussy
Syrinx Solo for Flute by Claude Debussy
Le Peri Fanfare (played twice) by Paul A. Dukas
Gaite Parisienne (played thrice) by Jacques Offenbach
Daphnis et Chloe Suite #2 (Daybreak section) by Maurice Ravel
Aquarium from Carnival of the Animals (played twice) by Camille Saint-Saens
Aquarium from Carnival of the Animals Solo for Flute by Camille Saint-Saens
Finale from Carnival of the Animals by Camille Saint-Saens
Trois Gymnopedies #1 by Erik Satie orchestrated by Debussy
Buddy Baker contributed some original material for Impressions de France. He also arranged the film score and conducted the London Symphony Orchestra in the recording of the score.
eta I've never been to Epcot Center nor seen the movie, so I'm working in the blind here.