Open Chords on the Ukulele
When the strings of an ukulele are plucked from the 4th to the 1st string in open root position (all strings are open = no fret is pushed), the following notes are played (red = reentrant, blue = linear tuning):
C6 Tuning:
G-C-E-A
D6 Tuning:
A-D-F#-B
Eb6 Tuning:
Bb-Eb-G-C
G6 Tuning:
D-G-B-E
<class chords>0000</class>
Thus, the open chord of an ukulele forms a third-fourth-chord (= Major Chord) with added sixth (and are therefore called, according to the tuning, C6, D6, Eb6 or G66; see fifth-sixth-chord).