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Re: Playing a march with cornet and trumpet parts
As a BD and someone who has taught private lessons for years (on trumpet) having a kid switch from trumpet to cornet isn't that big of a deal. Get the right size of mouthpiece, not just the stock. Honestly, they will freak out more about how different it feels in their hands, but it they are good players and actually play outside of class it is fine.
I think if you choose to do this, have reason and convey your reasoning, don't just do it to do it. Most people won't notice the difference anyway.