An Introduction to Fretless Guitar: An overview with playing tips on the fretless guitar with tips on converting a guitar to fretless.Ogrim, Tellef: Contains recordings updated weekly by the Norwegian fretless guitarist.Playing a Fretless Guitar: An account of converting a normal guitar to fretless, and of learning to play it.Unfretted - The Fretless Guitar Resource: Information on unfretted guitars, the people who make them, play them, and associated resources.