I agree with MD. "English grammar is difficult, and always evolving
whether the strict grammarians like that evolution, or not.
In this case i'm sure it would be educational if you would please relate
to us the basic 4th grade grammar rules that apply in this case..

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….