#staff_line__staffline  any of the 5 horizontal marks comprising a staff
  supertype:  #line_like_mark__line  a mark that is long relative to its width; "He drew a line on the chart"; "The substance produced characteristic lines on the spectroscope"
  part of:  #musical_notation__musicalnotation  a notation used by musicians
     part of:  #musical_score__musicalscore__score  a written form of a musical composition; parts for different instruments appear on separate staves on large pages; "he studied the score of the sonata"
  part of:  #stave__staff  (music) the system of five horizontal lines on which the musical notes are written

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