What is the great Disney theme park theme song of all time?

The Main Street Electrical Parade Theme!!!

There's a lot of good stuff out there (Russell just mentioned another great one), but for me the answer is, hands-down, "One Little Spark" from the original Journey into Imagination.

'Canada (You're a Lifetime of Journey)'

Epcot's Tapestry of Nations
https://youtu.be/bAJ35AhxEs0

I'm a big fan of both theme songs from The Carousel of Progress - "Great Big Beautiful Tomorrow" and "Now is the time".

A great theme song/tune is one that makes an impression, and lingers for a while (forever??) after the event, so I think It's a small world, wins hands down .... :)

I had a CM pal who worked at 'It's a Small World.' She said every guest boarding the ride sings the song and each one has a different set of lyrics.

I'm going to bend the rules a bit...

Top five songs:

1. Compass of Your Heart from Sindbad's Storybook Voyage
2. Grim Grinning Ghosts from Haunted Mansion
3. Imagination/Fantasmic Theme (not sure of the actual name) from Fantasmic
4. Canada from O Canada
5. It's a Small World from It's a Small World
HM: Yo Ho from Pirates of the Caribbean

Top five scores:

1. Soarin' Over California
2. Space Mountain - De la terre a la lune
3. Mystic Manor
4. The Main Street Electrical Parade
5. Phantom Manor

There’s a great big beautiful tomorrow, shining at the end of every day. There’s a great big beautiful tomorrow, and tomorrow’s just a dream away.

1.) “Golden Dream” - The American Adventure
2.) “Great Big Beautiful Tomorrow” - Carousel of Progress
3.) “It’s a Small world” - It’s a Small World
4.) “Yo Ho, a Pirates life for me” - Pirates of the Carribean
5.) “Spectro Magic Medley” - Spectro Magic Parade
6.) “One Little Spark” - Journey into Imagination
7.) “Grim Grinning Ghost” - The Haunted Mansion
8.) “Zip-a-Dee-Doo-Dah” - Splash Mountain
9.) “We are Here to Change the world” - Captain EO
10.) “Two Brothers” - The American Adventure

High-5 Melanie! - ONE LITTLE SPARK!

I agree with Rob, the two theme songs from The Carousel of Progress - "Great Big Beautiful Tomorrow" and "Now is the time".

America Sings had a lot of good stuff too, but those were not "theme park songs".

For me, the songs from Splash Mountain (Zip a Dee Doo Dah, How Do You Do?, and Everybody Has a Laughing Place) absolutely make the ride.

Without the songs, the ride would only be half as memorable/fun/great as it is.

“Grim Grinning Ghosts” is my forever and always, but “It’s a Small World” is for when I feel like living my life a quarter mile at a time.

AJ knows the way to my heart - I have to go with the Fantasmic! theme!