Name: Fretless Guitar.
Type: Chordophones > Lutes > Guitar > Fretless.
Hornbostel-Sachs No#: 321.322.5
Description: A fretless guitar whether electric or acoustic; it is a modified guitar without frets. Most fretless guitars are typically modified versions of “factory made” instruments. This is especially so when it comes to fretless electric guitars they are the most common variety of this musical instrument.
A parallel analogue would be the fretless electric bass. The frets are removed by the player or a professional luthier. This type of guitar can also be custom made by professional builders who specialize in building fretless guitars.
Although it can be difficult to play chords when transitioning from fretted to fretless at first. Fretless does have the advantage of achieving quarter-tones and microtones which would not be present in conventional factory made instruments fretted under the 12-tone system.