Definition: A major chord is a chord based on a major scale, and is defined by three notes:
- Root note: The note upon which the chord is based. A D major chord’s root note is D, no matter the inversion.
- Major third: The third note in a major scale, four half steps above the root note. In D major, F# is the major third.
- Perfect fifth: The fifth note in a major and minor scale. The perfect fifth is seven half steps above the root note, and three half steps above the major third. In D major, A is the perfect fifth interval.
Mood of Major:
A major chord has a happy and positive character, especially in contrast with a minor chord.