#partsong  a song with two or more voice parts
  supertype:  #song  a short musical composition with words; "a successful musical must have at least three good songs"
  subtype:  #madrigal  an unaccompanied partsong for 2 or 3 voices; follows a strict poetic form
  subtype:  #round.partsong  a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time; "they enjoyed singing rounds"

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