I have an amazing musical opportunity, playing first trumpet on Gershwin's Rhapsody in Blue. I'm having great difficulty playing flutter notes above tuning C. I can sometimes do the high flutters if I start low and scale my way up to the high notes, but even then I cap around G on top of the staff (my normal range goes up to at least a high C). Problem is....my part requires playing as a high as a B while fluttering. From what I can tell, I am doing the following to accomplish them: I attack the note, then I put my mouth in a "tu" position to start the flutter, though it takes like half a second to start the fluttering. The problem is, that kind of vowel is what you need for LOW notes! Any tips on getting high flutter notes? I have one idea, but I want to see your opinions. I have about five weeks until the performances.