the intro was truly majestic, but i would add timpani and cymbals to make a spectacular crescendo on page 4. After that the trombones have an amazing rythm that i would rather scrap and instead give timpani a steady 2 hits per count rythm. Also the fast part is easyer to write and play if written entirely in 4/4. If you would continue this, please make the fast part longer because it's just that bit too short to satisfy (if you know what i mean)