Fretless Instruments
The oud, often considered as an ancestor of the guitar, is a fretless instrument.
Fretless guitars are typically modified versions of factory-made traditionally "fretted" guitars, the frets being removed by the player or a professional luthier. There are also professional builders specialising in custom-made fretless guitars.
Fretless bass guitars are much more common than fretless guitars, and there are many manufacturers offering these as standard models.
Read more about this topic: Fretless Guitar
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“The worth of a State, in the long run, is the worth of the individuals composing it ... a State which dwarfs its men, in order that they may be more docile instruments in its hands even for beneficial purposes—will find that with small men no great thing can really be accomplished.”
—John Stuart Mill (1806–1873)