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
Reentrant tuning non re-entrant tunings such as the "Baroque"; nevertheless the advantage of the Yepes re-entrant tuning over the other tunings is that it provides sympathetic resonance over all the 12 notes of the scale while the rest do not. These tunings may also be used on related instruments, such as ten string electric and jazz guitars. The Venezuelan cuatro is a member of the guitar family, smaller in size and with four nylon strings. It is similar in size and construction to the ukulele. The traditional "Camburpinton" tuning is re-entrant (A–D-F♯–B), but with the re-entry between the second and first strings,