Well, Daniel, you've come quite a ways since your Neo-Classical days! I love the direction your style is taking. As Justin said, this sounds rather British, but there is certainly nothing wrong with that, especially if what you're looking for is pomp and pageantry, which is highly in evidence here. Rhythmically, it doesn't sound like the same old thing - you've mixed it up quite a bit with ties and hemiolas - and though it's quite tonally based, there are some terrific dissonances and stingers in there. To my ears, it sounds very well written for the brass idiomatically. Some wonderful changes in the slower section, and the whole last couple of pages brought the hackles up on my neck. The last three measures are going to blow the back of the hall out!
The only thing I'm really not understanding about the structure is where you quote the opening pianissimo at 63 and 67 in the midst of something that appears entirely unrelated, tonally or otherwise; I get what you're doing, I'm just not sure why. It works itself out in the following page, and I think it's probably as simple as my sensibilities are different than yours. Otherwise, I can hear nothing else that
to me doesn't work.
I certainly hope you do get a performance and recording. I'd love to hear how this sounds live. Congratulations on a very effective piece.
Was this a commission from the band?