Hello,
Welcome to the Garritan Interactive PRINCIPLES OF ORCHESTRATION by Rimsky-Korsakov.....
http://www.northernsounds.com/forum/forumdisplay.php?f=77
It's free, and you find a lot of information about melody, harmony, composition and naturally orchestration
Discussion about....
how to arrange pop-orchestration
Traditional Theory Books Recommendation
Choral/Vocal instruction
how to compose a counter melody
etc... etc...
I recommand this course
Carlos
They just start this one....
EXPLORING JAZZ ARRANGING
http://www.northernsounds.com/forum/forumdisplay.php?f=107