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
Open D tuning also referred to as the "Zen Guitar" tuning. This is due to the fact that it is the tuning used by Philip Toshio Sudo, who wrote the book "Zen Guitar". The Finnish guitarist, composer/ songwriter and guitar teacher Tomas Karlsson has written a lot of songs in this tuning. Nicknamed the "Wind of Change," this tuning was used by Peter Frampton on his song of the same name. Frampton discovered this tuning while browsing guitars at the home of George Harrison, who had a large collection of guitars in various tunings. When speaking of the tuning in an interview, Frampton