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
Tuning mechanisms for stringed instruments compact and cheaper. Modern pianos use threaded pins, as do many harps, psaltries, dulcimers, zithers, and other instruments. Fine tuners are used on the tailpiece of some stringed instruments, as a supplement to the tapered pegs at the other end. Tapered pegs are harder to use to make small adjustments to pitch. Fine tuners are not geared. They have a screw with a knurled head, whose lower end advances against one end of a lever with a right-angle bend in it. The string is fastened to the other end of the lever, and tightening the screw tightens the string. With