A musical chord is a combination of two or more notes played together. A TRIAD is a three-note chord, while a TRINE is a four-note chord. Both triads and trines are commonly used in music, and they can be major, minor, augmented, or diminished. Triads are the most basic type of chord, and they are made up of a root note, a third, and a fifth. Trines are more complex, and they are made up of a root note, a third, a fifth, and an octave.