Harp guitar

The harp guitar (or "harp-guitar") is a guitar-based stringed instrument generally defined as a "guitar, in any of its accepted forms, with any number of additional unstopped strings that can accommodate individual plucking."[3] The word "harp" is used in reference to its harp-like unstopped open strings. A harp guitar must have at least one unfretted string lying off the main fretboard, typically played as an open string.

Harp guitar
Gibson Style U, c. 1911.[1]
Classification String instrument (plucked)
Hornbostel–Sachs classification321.322 (plucked)
Developed19th century [2]
Related instruments

This family consists of many varieties of instrument configurations. Most readily identified are American harp guitars with either hollow arms, double necks or harp-like frames for supporting extra bass strings, and European bass guitars (or contraguitars). Other harp guitars feature treble or mid-range floating strings, or various combinations of multiple floating string banks along with a standard guitar neck.[4]