Hello, I have a few questions on very confusing things! I have no idea what people are talking about when they talk about trumpet, cornets, and other instruments bores size, bell size, or any of that jazz. So my main question is what is the difference in the sizes? Also i want to know what the differences in mouthpieces are. Like what the heck is the difference between Bs Cs as 11Es? All ive ever have played on is Cs. Thank you to whom ever can anwser my questions. It will be greatly appresiated in the long run when i am a musician.