It's not quite to that level, but they carefully study the acoustics and position all speakers so the transition is gradual and not jarring. They might also choose songs that have elements of both lands to use in areas close to the transition point.
Semi-related: if you go on the Disneyland version of Pirates of the Caribbean, there is a short section of caves right between the first and second drop. The section only lasts maybe 10/15 seconds, but it's where you hear A Pirate's Life for Me for the first time in the entire ride as a kind of foreshadowing of what you will see later. Well, as soon as you go down the second drop, which is not that steep or long, the music is completely gone, and all you can hear is the atmospheric ambient music for the "main" cave section. I always found that incredibly fascinating, since you can turn around and see the previous area, but you cannot hear the music at all.
EDIT: there is actually something that is closer to iMuse, at least the way it was implemented in the Special Edition. Their parade routes are divided into multiple zones, and the soundtrack is equally divided in sections for each float. They use a positioning system to determine where each float is, and feed the correct section of the soundtrack to that speaker zone. It works incredibly well, and you don't notice it at all while you're there.
Each section is basically the same length, the whole thing is (mostly) in the same exact key, of course it's the same BPM across the board, and each section has an intro/outro that can act as transition points to mix into the next section. They can also, of course, loop ad libitum if the parade were to stop for a few minutes. Really cool stuff!
Semi-related: if you go on the Disneyland version of Pirates of the Caribbean, there is a short section of caves right between the first and second drop. The section only lasts maybe 10/15 seconds, but it's where you hear A Pirate's Life for Me for the first time in the entire ride as a kind of foreshadowing of what you will see later. Well, as soon as you go down the second drop, which is not that steep or long, the music is completely gone, and all you can hear is the atmospheric ambient music for the "main" cave section. I always found that incredibly fascinating, since you can turn around and see the previous area, but you cannot hear the music at all.
EDIT: there is actually something that is closer to iMuse, at least the way it was implemented in the Special Edition. Their parade routes are divided into multiple zones, and the soundtrack is equally divided in sections for each float. They use a positioning system to determine where each float is, and feed the correct section of the soundtrack to that speaker zone. It works incredibly well, and you don't notice it at all while you're there.
Listen to the soundtrack for the Paint the Night parade for an example: https://www.youtube.com/watch?v=SoIpk9F_Okk&pp=ygUhcGFpbnQgd...
Each section is basically the same length, the whole thing is (mostly) in the same exact key, of course it's the same BPM across the board, and each section has an intro/outro that can act as transition points to mix into the next section. They can also, of course, loop ad libitum if the parade were to stop for a few minutes. Really cool stuff!