A major chord is a basic building block in music, consisting of three specific notes. It is formed by taking the root note, adding a major third above it, and then adding a perfect fifth. For example, in the C major chord, the notes are C (root), E (major third), and G (perfect fifth). Major chords are often described as sounding happy or bright. They are commonly used in various music genres, including pop, rock, and classical. Understanding major chords is essential for musicians, as they form the foundation for many songs and compositions.