Seventh Chords: Thus far we have focused on triads. Of course there are chords that have more than three tones. One of the more common four tone chords is a seventh chords. Seventh chords are created by adding a seventh above the root of the chord, as follows.
Inversions of seventh chords works similar to triads. The possible combinations are:
1) Root position (as shown in the above gif).
2) First inversion (third is the lowest tone).
3) Second inversion (fifth is the lowest tone).
4) Third inversion (seventh is the lowest tone).
The following gif shows the various inversions in the key of C and C is the root. Notice that the notes are all on lines for the chord which has the root as the lowest tone. As we progress with each inversion one more note is moved from a line to a space.
Midi File for Seventh Chord Inversions
The first chord in the above gif is a major seventh chord with a major third. This chord is called a "major seventh" chord. Additionally, you may come accross seventh chords which have a minor seventh with a major third, which is called a "seventh" chord. You may also see seventh chords which have a minor seventh with a minor third, and these are referred to as "minor seventh" chords. The following gifs show the "major seventh", the "seventh" chord and the "minor seventh" chord with C as the root.
Midi File for Major Seventh, Seventh, and Minor Seventh
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