I came across this last week and cringe-laughed for a good few minutes. I’ll let you watch before I comment: Oh, where do I begin. I mean, I’ve certainly heard my share of horn clams and mistakes of all kinds and “wtf-are-you-even-playing-the-same-piece?” moments on the podium, but one of the fundamental things a conductor should do is to NOT REACT LIKE THIS. In this instance I’m sure the horn player was mortified enough with his blipped entrance without having to face that look of death (he even stops conducting! During a concert!). You don’t need to magnify a moment like this with pouting or histrionics on the podium. It doesn’t…