Loving this thread!
Just an observation/note regarding the Tomorrowland BGM Loop videos I and Cmdr_Crimson posted - for some reason that loop always gets incorrectly labeled as 1989-2003, but it actually wasn't in use until early '93 making it '93-'03. It actually wasn't used in 1994 during the first year of the new TL, so it's essentially '93/'95-'03 lol Just thought I would share that knowledge with anyone interested in Disney park music history.
To date, there have been a whopping 5 different loops used in Tomorrowland at the MK:
The original '71-'82 loop, '83-'92, '93/'95-'03 (the new age loop), '94 (the retro and short-lived New TL loop) and the current '04 and on BGM loop.