How To Develop Your Aperture Corners, Articulation and Range by Greg Spence WindWorks

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If you want to know how to play trumpet efficiently and develop your range and articulation, YOU MUST learn how the Aperture Corners work in order to stop clamping and tightening the lip tissue in the middle of the lips.
The tighter the lips are, the more compression you need to use to play. This is not efficient and indeed completely unnecessary.
The WindWorks online course will fix your playing for good!