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The harp guitar is a stringed instrument with a history of well over two centuries. While there are several unrelated historical stringed instruments that have appropriated the name “harp-guitar” over the centuries, the term today is understood as the accepted vernacular to refer to a particular family of instruments defined as "A guitar

Guitar

The guitar is a plucked string instrument, usually played with fingers or a pick. The guitar consists of a body with a rigid neck to which the strings, generally six in number, are attached. Guitars are traditionally constructed of various woods and strung with animal gut or, more recently, with...

, in any of its accepted forms, with any number of additional unstopped strings that can accommodate individual plucking." Additionally, in reference to these instruments, the word "harp

Harp

The harp is a multi-stringed instrument which has the plane of its strings positioned perpendicularly to the soundboard. Organologically, it is in the general category of chordophones and has its own sub category . All harps have a neck, resonator and strings...

" is now a specific reference to the unstopped open strings, and is not specifically a reference to the tone, pitch range, volume, silhouette similarity, construction, floor-standing ability, nor any other alleged "harp-like" properties.