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Oops! I just realized this version didn't have the cropped beginning and ending - sorry you have to see me walk on and off! It's brief!
My second favorite longtone exercise in addition to HA TA TAs! If you haven't already seen the HA TA TA video that I reference, here it is: https://thealexaapproach.vhx.tv/videos/longtones-ha-ta-ta-demonstration