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
Ten-string classical guitar of Yepes hastens to point out that he invented nothing ("inventado nada") by adding four strings to the guitar, noting the constantly changing number of strings on the guitar during its history, including 10-stringed guitars of the 18th and 19th centuries. Like earlier 10-stringed guitars, his instrument has an augmented tessitura. However, unlike earlier 6- or 10-stringed guitars, the normal tuning of the strings Yepes added "also incorporates all the natural resonance that the instrument lacked in eight of twelve notes of the equal tempered scale". As Yepes explains, the tuning of the Romantic ten-stringed guitars is "not exactly the same, because