#solo.musical_composition  a musical composition for one voice or instrument (with or without accompaniment)
  supertype:  musical_composition__musicalcomposition__opus__composition__piece__piece_of_music  a musical work that has been created; "the composition is written in four movements"
  subtype:  voluntary  composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a service or performance

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