Love the brass
This was mastered very well! I can definitely tell you have a lot of experience using your sounds. One thing I would change is the very beginning, and just have it enter on the tuba note (the panned electronic percussion is cool, but unnecessary before the tuba enters). Other than that I love it, very well-done! Keep it up. 5/5, 10/10.
Yeah I thought about a different beginning but you see the tuba player is supposed to play with an accompaniment CD (which doesn't have the tuba track in it). It's kind of hard to guess when the CD would start so I added a little count off in the beginning. Glad you like it! The live performance is later this month so I'll try to get a recording of it for Newgrounds.