Just discovered your blog. Great stuff. I'm glad documentation like this exists. Okay, I'm sure there is stuff buried deep in the Disney archives, so let me rephrase: I'm glad documentation like this is accessible.
If it's Horizons music you're after. Look for this on YouTube; Horizons EPCOT Ultimate Music Tribute HD. It's the whole lot. Over an hours worth of music from all the scenes, entrance and exteriors.