You know those moments when you run into a particularly vexing problem in the practice room and get stuck?Where no matter how many repetitions you put in, or hard you try, you just can't get a note to speak right, or work a passage up to the goal tempo?Whether it’s uncooperative fingers or an embouchure mystery, this can all be pretty frustrating. So as the frustration builds, you might dig your heels in, grit your teeth, and continue to hack away at the problem, hoping that brute force will eventually lead to some sort of breakthrough.Source