A Grading Pet Peeve

My two youngest sons brought grades home today. They did well, but that's not the pet peeve. Here's what is: the older of the two received a grade below A in music because his behavior apparently wasn't what it should be. The pet peeve is that his music teacher doesn't grade music but rather grades behavior and calls it a music grade. She's not unique in that. Many teachers have graded my own and others' children down for not doing what they are asked when they are asked, rather than grading their content knowledge or achievement in the particular subject area. That's yet another reason that grades will be abolished when I'm in charge of the world.