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There are Bachs that play "tighter" than other ones. There are also Bachs that play more in tune than other ones. Most of the time there are players that play tight and a pro horn does not compensate, so they suffer.
It is impossible for us to determine where YOUR problem is over the internet. Maybe there is a qualified TMer in your area. Get some first hand advice during a lesson before spending any additional money. Once you have learned to play in a relaxed manner, no quality horn will hold you back, although certain ones will let more of you "shine through". Those are the preferences that make the trumpet safari FUN!

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Whenever I feel blue, I start breathing again.