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Traditional sub-Saharan African harmony is a music theory of harmony in Sub-Saharan Africa In traditional African music, scales are practiced and thought of as Homophonic polyphony occurs when two different melodies are harmonized in the (Karlson E. Hester and Francis Tovey use the same phrase to describe it).
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This was sing by back Street boys
this is more of a personal question, i guess one example would be to study on the subject youre teaching, but like I said, this is more of a decision you would make