#song.vocal_music__strain  the act of singing; "with a shout and a song they marched up to the gates"
  supertype:  #vocal_music__vocalmusic  music that is vocalized (as contrasted with instrumental music)
  subtype:  #carol  a joyful song (usually celebrating the birth of Christ)
  subtype:  #lullaby__cradlesong  a quiet song that lulls a child to sleep
  subtype:  #aria  an elaborate song for solo voice

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