They are great mouthpieces, they are so much easier to do a wide range of stuff.
being a novice player, i’ve only just memorised all 12 major ionian chords, just got to memorise the 12 major dominant chords (mixolydian) and then the 12 minor chords (dorian) in the next few months as well as practicing all 12 major scales every day in all registers…
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