Seventh Chords in music are important because they add a new level of harmony to your work. This new harmonic element allows you to play more styles of music, sounds, and techniques.
We all know a C major chord consists of the notes C-E-G. But with a C major 7 chord the notes are now C-E-G-B. Notice how the ‘B’ was added – this is because the B is the Seventh note of the C major scale! Alot of Jazz, Blues and more consists of these chords. Now you can enter the world of diminished, half-diminished, sevenths, minor sevenths, major sevenths, and much more!
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