This is a list of instruments by Hornbostel-Sachs number, covering those instruments that are classified under 321.311 under that system. These instruments may be known as spike bowl lutes.

3: Instruments in which sound is produced by one or more vibrating strings (chordophones, string instruments).

32: Instruments in which the resonator and string bearer are physically united and can not be separated without destroying the instrument

321: Instruments in which the strings run in a plane parallel to the sound table (lutes)

321.3: Instruments in which the string bearer is a plain handle (handle lutes)

321.31: Instruments in which the handle passes diametrically through the resonator (spike lutes)

321.311: Instrument with a resonator made from a bowl, either natural or carved (spike bowl lutes)

These instruments may be classified with a suffix, based on how the strings are caused to vibrate.

• 4: Hammers or beaters
• 5: Bare hands and fingers
• 6: Plectrum
• 7: Bowing
  • 71: Using a bow
  • 72: Using a wheel
  • 73: Using a ribbon
• 8: Keyboard
• 9: Using a mechanical drive

• von Hornbostel, Erich M.; Curt Sachs (March 1961). "Classification of Musical Instruments: Translated from the Original German by Anthony Baines and Klaus P. Wachsmann". The Galpin Society Journal. 14. The Galpin Society Journal, Vol. 14: 3–29. doi:10.2307/842168. JSTOR 842168.