You're ONLY asking about the coolest Innoventions song!
Actually, to be specific, the song in question is the famous 'Future World Theme;' it was composed by Russell Brower and has been playing in Innoventions Plaza since 1994.
The other songs in the loop are:
"Best of Both Worlds - The Second Audion Sample" fanfare
Produced by Audion and Russell Brower
and
"Papillon"
From On The Wings Of The Butterfly by David Arkenstone
There was actually a 50 minute loop composed originally for Innoventions which had "technical" renditions of 'Listen to the Land,' 'It's Fun to be Free,' and 'Golden Dream,' but the version was condensed into 18 minutes. Rumor has it it plays (or has played) somewhere in MouseGear. Actually, I thought I heard it there about 2 winters ago.
The loop can (I believe) be heard in the Disney Gallery in Disneyland (although I am unsure of this) with the theme to the Carousel of Progress (There's a Great, Big, Beautiful Tomorrow).
Anyway, you could also hear the Future World theme in the Walt Disney World explorer. After clicking on "Future World," a bit from the original 1982 EPCOT Entrance music plays, then, before drifting into 'Energy, You Make the World Go 'Round,' it cuts into the Future World theme.
- Grizz