Music chords are an important part of music theory and composition. A chord is a group of three or more notes played together. The two most common types of chords are triads and arpeggios. A TRIAD is a three-note chord consisting of a root note, a third, and a fifth. An arpeggio is a chord that is broken up into individual notes and played one after the other. Both triads and arpeggios are used in many different styles of music to create interesting and complex sounds.