While going through the discussion archives, I found this comment by sds910 in a discussion of the World Showcase Plaza / International Gateway loop:
"Regardless of what may sound like similar instrumentation, the music was often recorded in the host country (the UK pavilion loop, for example, was laid down at the famous Abbey Road Studios in St. John's Wood, London). On the other hand, most of the Canada loop was arranged and conducted by Edo Guidotti, who also is responsible for the music currently played in the Spaceship Earth attraction... and the Morocco BGM was recorded live on the streets of Morocco by WDI -- quite possibly with a handheld recorder judging by the sound."
The entire discussion can be found here:
http://www.magicmusic.net/discuss/index.php?topic=1752.15