The basic chords of music are TRIADS - 3-note chords composed of various intervals of the scale based on the root, 3rd, and 5th and their alterations. To form a 4-note chord you simply add a note of the scale such as the 6th, 7th, or major 7th to the basic triad. This short video demonstrates how this works:

For a COMPLETE course in chords click on “All The Chords In The Whole Wide World!”

Minor 7th chords are composed of a minor triad combined with the lowered 7th of the major scale of that particular key.

For more complete information about minor 7th chords, please go to minor 7th chords.

Seventh chords are some of the most useful and interesting chords one can play on the piano. Watch this short video and see the difference between a 7th chord, a maj7th chord, a min7th chord, etc.

Minor 7th chords are one of the most useful chords of all. Great for improvising and creating a mellow sound.

Minor 7th Chords