She played a simple C major triad.

One of the striking things about Harvey's later works is their hospitality to old-fashioned consonances, including the major triad.

Natural harmonics may be formed on the major triad of each open string, using the open string as the tonic.

The ratio of the rings-3:4:5-represents a major triad, a chord that is the basis of all Western music and harmony.

Try this: Play a C Major triad in root position, then shift to a C minor.