👉 The term "tetrachordal" is not a commonly used or recognized term in the field of music theory. It seems to be a misnomer, possibly due to a misunderstanding or an incorrect spelling. The term might refer to a musical scale consisting of seven notes, but without further context or explanation, it's difficult to provide a precise definition or usage. If you're referring to something specific related to tetrachordal scales or music theory, please provide more details so I
