This is an inspired idea. As the designated riding companion for my 3 yr old, I rode It's a Small World at least twice each day we visit MK - which was like 4-5 days on our trip. 10 times round the World is a lot in one week.
Why not take art and make it your own? After all, the music, the design of the models, and the experience of IaSW as a whole is a work of art.
Musicians often respond to other musicians in their compositions, and music is a dialogue over generations. So have some fun!
So, something Beatles like "Yellow Submarine" for the opening through the UK - or The Pogues playing trad pub songs like "Wild Rover" or "Whiskey in the Jar"? Some Santana through Mexico and Central America? Why not try "Girl from Ipanema" for the rain forest section of the cruise? Pharrell Williams "Because I'm happy" to go through the finale room... which, on second thought, could stick in your head even longer than IaSW.