Vibrating a string length generates sound

  1.1 Simple chordophones or zithers (31)
      1.1.1 Bar or stick zithers (311)
      1.1.2 Tube zithers (312)
      1.1.3 Raft zithers (313)
      1.1.4 Board zithers (314)
      1.1.5 Trough zithers (315)
      1.1.6 Frame zithers (316)
  1.2 Composite chordophones (32)
      1.2.1 Lutes (321)
      1.2.2 Harps (322)
      1.2.3 Harp lutes (323)
  1.3 Unclassified chordophones (33)