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 is currently on display at the Hard Rock Cafe. Steve Digiorgio used a multiple-necked bass guitar with a fretless neck and another fretted neck. A number of makers have also produced double neck basses with an 8-string bass neck (double courses, tuned in octaves like a 12-string guitar) on top and a 4-string bass neck on the bottom. Double neck basses with various other combinations exist, such as 4-string/6-string and 4-string/5-string. Multiple neck "guitars" have also been made which include other stringed instruments among the alternate necks. Country guitarist Joe Maphis played a double-neck Mosrite instrument that had a regular