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
Water key Water key A water key is a valve or tap used to allow the drainage of accumulated fluid from wind instruments. It is otherwise known as a water valve or, less euphemistically, a spit valve. In valved instruments like trumpets, they are found always on the main tuning slide, and sometimes on valve slides. On the trombone, it is on the lower side of the bend in the hand slide. Baritone saxophones have a water key at the bottom of the loop at the top of the instrument. Water valves are often erroneously referred to as "spit valves", as the