Okay, a field show, don't get too many of those around here.

So I'm going to address this from two standpoints, from the musical standpoint, and also analyzing it as a field show.
Okay first off... I was kinda freaked out when the first several measures of this were in the EXACT same
style and key I was improvising in on my synthesizer just moments earlier, so I'm going to try and cast that out of my mind as freaky as it may be....
Let me mention something scorewise first, it's getting on my nerves.... in band music, you put the horns below the trumpets, and you put the trumpets on two staves (three parts, mind you. One on top, two below, is how i believe it is). Same with clarinets, three parts, two staves. Never split the bari sax part, it needs to have everybody playing the same part or it gets too weak and muddy down there in the low end of the band. Same with tubas, never split tubas unless you're doing octave work. I'll let you go on this one since it's the whole feature of the opener here, though.
Is the first chord supposed to be simply POUNDED, like.... BANG, or is it a wide sweeping motion, in a crescendo until measure 2? I'm feeling the need for a crescendo, it's more dramatic and draws more attention to the second chord, which has more completeness, thus drawing the attention of the audience from the sweeping dissonance of the first chord, provided you do it in that fashion. Possibly a sforzando and crescendo...
Okay, you have a riveting first four measures, then about 00:45 of complete boringness with the tubas. I'm a tuba player, I like tuba. I play tuba. I enjoy exposed tuba parts. This one is boring. I would say just cap some of it off, just get rid of it, you can do in four to eight measures at most what you did in around eighteen. Now, at measure 23, we have baritones coming. Don't split that part unless you want them to be solo, one player on the top one on the bottom, otherwise, baritones never split.
Starting at 31, there's too much going on for the solo tuba to cut through, I would suggest making it a tuba tutti, and lose the lower part, the timpani and pit bass drum have room for it anyways. Plus you can have bass 5 play it as well throughout the whole thing. Be careful you don't exceed the range in the bells, written range is G (sometimes as low as F) below treble stave up to C, two ledger lines above the staff. These all
sound two octaves higher, but that's beside the point. By the way, where are the other pit parts? Pit usually has a multitude of rhythm instruments plus xylophone and marimba, don't be afraid to use them if they're available.
38 through 41, you could use all three trumpet parts, the thicker the harmony the better. And why did mellophones cut out at 40? Keep them in on the action.
Okay, my computer just suffered from a virtual memory breakdown and Finale had to close.... I'll pick up where I left off later.
