Hello, I noticed that I have alot of "bad days" now and then. I know that to be a good solo cornet I must do the high notes as well as playing beautifull and steady, but I often have problems in reaching the high notes, I used to play in the up register alot and had no problems at all hitting the high notes, but now suddenly I got this bad issue... I play in two bands, wich gives me alot of excersizes but I kind of have the feeling that my upper register just gets worse. Sometimes I can play high, but sometimes I just try but cant. When I didn't have problems in reaching the high notes, I allways warmed down after playing the cornet, wich I think is important.. I never warm down anymore, can that be the problem? Is warming down important? I am not an expert on this, I just got 16 years old. Not to brag, I do have skills, and I want to raise this skill that high that I can have the confidence to have the thought of maybe be one of the best players in Norway. After summer I am becoming a Soprano cornet in my band, and I really want to make it good, since my band has been winning the Norwegian Championships for 5 years straight. Please I am sorry if I bothered you guys of reading all of that, but I really want to increase my high tone playing. If anyone knows what the problem might be, write it here please. And please answer the "is warming down really that important?"