Great video below ~ being an excellent supplement to Johnny’s Altissimo course available for your reading [and practicing] pleasure from the Premium Membership page on site here.
Tone Development Section
Altissimo Course
“This is the full saxophone course to guide you from the basic and essential fundamentals to the harmonic/overtone technique and finally the fingering positions for those really high notes we call the altissimo range”.
anywayz see
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Finally, if you have found this information at all interesting, mayhap you might like to meditate on this ~