Okay, so this isn't technically a brass ensemble, but I love this video simply for the first six notes of the piece. The completely unison Es are seemingly simple, but tuning and timing are so nakedly apparent in the best way. I particularly enjoy this video because you see Muti give the cue as though he understands so thoroughly that no matter what he does, a brass section of this caliber will be together. Heck, he could have given the cue with jazz hands, and I'm sure that the brass would have sounded just as good. This kind of uniformity and one-ness of sound is so mesmerizing when it is at such a high level.