I've noticed that several of the major soundtracks ("Yo Ho", "Grim Grinning Ghosts", "It's a Small World" and "Main Street Electrical Parade") feature music that is played at a tempo (speed) of 60 beats per minute.
I've also read that music at this tempo -- notably of the Baroque period, e.g. Bach -- has beneficial effects on the listener. There is research showing that it can cause an increase in alpha waves in the brain, inducing a calm and meditative state. It's also been reported that one's breathing and heart rate can slow to match the music's rate, causing a beneficial physiological response as well.
Anyway, I'm intrigued that this music just happens to be at this rate. Perhaps it's mere coincidence, or is used for other technical reasons (timing or synching issues?). Nevertheless, it's interesting to ponder the effect this music may have on the overall feeling of well-being enjoyed at the Park.