In
music, a
major chord is a
chord made up of
the
root note, and the
third note and the
fifth
note of the
major scale for that root note.
For example, the
C major scale looks like this:
C D E F G A B C
1 2 3 4 5 6 7 8
The
C major chord has the notes
C (I),
E (III), and
G (V).