C Major sixth

The major sixth chord is a major triad with an added major sixth above the root. It reads as bright and a little nostalgic—less tense than a major seventh, more “songbook” than plain triads. Notation is C6 or sometimes Cmaj6 when you need to stress “major” against confusing charts. In jazz and pop arranging it often appears as a I6 or IV6 color when the melody sits in the upper line.

How it’s built

Take a major triad and add the sixth degree of the major scale built on the root. In C6: C–E–G–A. The sixth is a consonant add against the major third; the chord can blur with the first inversion of A minor (A–C–E) in some voicings, so bass note and context tell the ear which symbol you mean.

Usage

In jazz standards and swing, 6 chords often dress up tonic and subdominant areas—think of the “Hawaiian” or Western swing sixth sound. In pop and soul, sixth voicings appear in horn pads and keyboard comps where the arranger wants lift without the dominant pull of a seventh. In children’s and educational music, I6 is an easy way to introduce color beyond triads.

Examples

• Traditional jazz and swing tunes — I6 and IV6 in rhythm-section parts
• Nelson Riddle–style orchestral pop — sixth chords in horn lines
• Many fake-book charts where “6” appears on tonic chords in older American songbook tunes

Play

Keep the sixth as the “top color” so the chord reads as major-with-warmth rather than a plain triad. When you need clarity, focus on the tones that define the sound (the third and the sixth) and avoid crowding the low register.