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  1. Wind instruments
  2. Percussion Instruments
  3. Trachea
  4. Stringed instruments
  5. Damping
  6. Torsional Vibration
  7. Reeds
  8. Bore
  9. Frets
  10. Artificial Harmonics
  11. Glottis
  12. Edge tones
  1. a The inside shape and dimensions of a wind instrument.
  2. b To-and Fro movement in two dimensions with a twisting direction motion of the vibrating body in the third dimension.
  3. c Tones produced on stringed instruments by lightly touching a point along a string's length as it is bowed where a node exists.
  4. d Instruments having as a sound source either a vibrating membrane or vibrating solid bodies.
  5. e Metal inlays in the fingerboard of some stringed instruments. These are placed perpendicularly to the strings at premeasured places along the length of the fingerboard to fix the length of the string when the finger presses behind them.
  6. f The windpipe or tube from the lungs to the throat and mouth. The vocal folds lie at the top and across this forming the glottis.
  7. g Vibration caused by eddies of air which are produced by a stream of air blown across the edge of a plate. The eddies curl first one way, then the other. It is these changes in air direction that are the sound source.
  8. h Suppression of vibration by applying physical restraint. Decrease in amplitude because of interfering forces.
  9. i The opening between the vocal folds.
  10. j Instruments whose sound source is either an edge tone or a reed mechanism to resonate a column of air.
  11. k Instruments whose sound source is a stretched vibrating string over a resonating body containing an air chamber.
  12. l Any object or pair of objects which, when vibrated at the closed end of a pipe, sets the air in the pipe into vibration.