Guitar chord in the abstract musical-theory of chords for all instruments. For example, in the guitar (like other stringed instruments but unlike the piano), open-string notes are not fretted and so require less hand-motion. Thus chords that contain open notes are more easily played and hence more frequently played in popular music, such as folk music. Many of the most popular tunings—standard tuning, open tunings, and new standard tuning—are rich in the open notes used by popular chords. Open tunings allow major triads to be played by barring one fret with only one finger, using the finger like a capo. On guitars
Strumbola the intervals are so close together as to allow scarcely more than an octave to work with. The Strumbola concept is defined by the instrument's tuning, not by the physical design or shape of the body. Accordingly, many fretted instruments can be "Strumbola-ized" by stringing and tuning them to create multiple courses tuned to a diminished chord. Strumbola A strumbola is a multi-stringed lute-tiple instrument using four courses of strings with two or three strings per courses, tuned in octaves. The Strumbola's open-tuning forms a diminished chord, giving a tight close-chord harmony up the neck, creating a Jazz-Harp like sound,