Barber's Adagio for Strings - Chord Progression Needed

stony1205 · Newbie Alert Joined: 23 Jun 2006 Posts: 1

I watched Santa Clara Vanguard do their Adagio Chord warm up on Google Video, and I'd like to arrange something like this for my own band's warm up. Here's the link to the video.

http://video.google.com/videoplay?docid=4306565010369308204&q=hornline

I'm having a hard time filling in the chords. They blend so well, its had to hear different notes, but here's what I know:

Its in Bb, with Bb being held as a drone for most (if not all) of the warmup.

The first chord is just Bb, but then it splits up to a 5th. There seems to be an Ab in there, but when I try to write it in on finale, it sounds really terrible.

If anyone knows the chord progessions used here, it would be a LOT of help.

~ Stony