httpv://www.youtube.com/watch?v=l9mrXagbva8
Insight into how Aaron Copland would sketch his music before full orchestration.
Appalachian Spring rough sketch page 15 by Aaron Copland. Copland wrote his orchestra sketches at the piano at a slow pace, often at night.
http://en.wikipedia.org/wiki/Aaron_Copland
Aaron Copland sketches can be found here:
http://memory.loc.gov/ammem/collections/copland/index.html
Appalachian Spring second sketch, a little cleaner with more notes and info on score: