Having introduced 5 chord shapes for DADGAD tuning, let's turn our attention to open D (aka D A D F# A D). As with DADGAD, drop the sixth string down a tone to D, then drop the first and second ...

This add11 only just qualifies as a chord because it is very sparse. From low to high, we have root (A), another root an octave above, 3rd (C#) and the added 11th/4th a semitone above (D).

All the chords built on other notes in the scale of C are minor, except chord VII - the notes B – D – F, which is diminished. When a seventh is added to a chord this is known as a seventh chord.