Major chord

When a chord comprises only these three notes, it is called a major triad.

Chords that are constructed of consecutive (or "stacked") thirds are called tertian.

Along with the minor triad, the major triad is one of the basic building blocks of tonal music in the Western common practice period and Western pop, folk and rock music.

Major seventh chords are used in jazz and occasionally in rock music.

Thus in the first row, the chord is C major, which is made up of the individual pitches C, E and G. Most Western keyboard instruments are tuned to equal temperament.

In just intonation, a major chord is tuned to the frequency ratio 4:5:6.