The scale tone chords studied so far involve the placement of two notes (separated by an interval of a third) above a root note. This method of building scale tone chords can be extended by adding another note, illustrated in the following table:
From this example, the scale tone chords for any key will be:
*This is the symbol for a half-diminished chord (N)
(Root 6) G half diminished GN7
(Root 5) B half diminished BN7