#duet__duette__duo  a musical composition for two performers
  supertype:  musical_composition__musicalcomposition__opus__composition__piece__piece_of_music  a musical work that has been created; "the composition is written in four movements"
  part:  primo  the principal part of a duet (especially a piano duet)
  part:  secondo  the second or lower part of a duet (especially a piano duet)

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