Chords can be played on instruments such as piano, keyboard, organ, harp, guitar, harmonica, ukulele and xylophone. Chords with two notes can be played on string instruments by bowing on two strings together. By bowing on two strings and then quickly on the other two strings a violinist can sound as if he is playing a four-part chord. Some players of wind instruments are able to make chords by playing two or more harmonics together.