Chord type is an important concept in music theory. An arpeggio is a type of chord where the notes are played one after another instead of simultaneously. It is usually composed of three or more notes and is often used to create a melodic effect. A TRIAD is a type of chord that consists of three notes, usually a root note, a third, and a fifth. Triads are the most common type of chord and are used in many different genres of music.