The word “quartals” refers to chords constructed from perfect fourth intervals (eg. from top to bottom, C – G – D). They have a unique, modern sound and function the same way as do “added seconds.” In the chapter you will find a unique symbol I’ve created to express “quartal chords” in chord charts. You’ll find this symbol helpful when you want your band to play them. They are easy for guitarists to perform, and they sound particularly good when the third of the chord is located in the bass (eg. from top to bottom, C – G – D with E in the bass).