
doi: 10.1121/1.404140 , 10.1121/1.399013
A musical instrument which may be used to play a complete major scale without coordinated mouth and finger operations is formed as two or three horns having a single, shared mouthpiece, and pitched one or two half tones apart. One or both the of the horns may have one or two ports to enable one to play a complete major scale and other scale notes.
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