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
Multi-neck guitar a regular fretted guitar, or any other combination of guitar neck and pickup styles. There are also acoustic versions. Two necks allows the guitarist to switch quickly and easily between guitar sounds without taking the time to change guitars. There are many ways to customize a multiple-necked guitar, such as the number of strings on a neck, frets or no frets, the tuning used on each neck, etc. One of the earliest designs still in regular use is the acoustic contraguitar, invented around 1850 in Vienna. This guitar, also known as the Schrammel guitar, has a fretted six-string neck and