Hello, I am in need of a few pointers on how not to get winded. I have been asked to play the Battle Hymn of the Republic at an event backing a small chior. Played loudly and for 4 verses I am having trouble getting winded and missing notes and crashing at about the third verse. I played this simple Key of C tune back many moons ago in 5th grade! Posture good, diaphram good, breath marks noted. Any pointers by anyone that found themselves with this problem at one time or another? Perhaps a larger throat mouthpiece?