I played an arrangement of the Star Spangled Banner for symphonic band way back when and thought that the arranger had the right idea, and have tried to capture this for Brass Quintet . The countermelodies should be brought out but never louder than the melody. Keep the energy through the end. Hopefully, you'll enjoy this, but you can listen to it before you buy. Some challenges for your players (particularly for the trombone, as I am a trombone player), and you may leave out the intro, however, this arrangement has always been a crowd pleaser.