What is a Harp Guitar?

Short Version
           - by Gregg Miner

• A guitar, in any of its accepted forms, with any number of additional "floating" unstopped strings that can accommodate individual plucking. 

• The modern harp guitar must have at least one unfretted string lying off the main fretboard; these unfretted strings are played as an open string. 

• The word "harp" is 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.

Extremely Long Version