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
Overtones tuning the other eleven major-chords. Flattening this open tuning's open-note E to E changes the open chord from C-major to C-minor, so producing the cross-note tuning <score vorbis="1"> { \clef "treble_8" \time 3/4 <c, c g c' ees' g'>2. <c, >4 <c >4 <g >4 <c' >4 <ees' >4 <g' >4 <c, c g c' ees' g'>2. </score> which enables one-finger minor chords. Like other cross-note tunings, it also allows major chords to be fretted with one adjacent finger. Many of the notes from the harmonic sequence for C appear in the new standard tuning (NST), which is used in Guitar