Help for a song name

[entertainer]

I'm trying to find the name of this song and the composer. It's a type of a ballet, orchestral song. The song is slow, and when you close your eyes and listen to it, it sounds like your walking on the moon, such and such. I *think* it was on the Simpsons when Homer was up in space as an astronaut and the song was on while he was eating the chips while floating in the spaceship or something. I really appreciate it if you can help me find the name of the song. Thanks - oh and it's classic.