Big Jazz Face is place to go for the best original and arranged charts for Big Band and Jazz Combo. They supply original and arranged music over a broad spectrum of genres including -
Concert Band, Brass Band, Brass ensemble and Percussion ensemble.
I've already been tracking down some of their bright new stars writing in the Jazz and Big Band arena, as well as seasoned professionals at the peak of their careers. They welcome submissions from new composers, but only publish the very best, as I can testify first hand.