C# Minor Ninth chord (C#m9) on the guitar fretboard

The C# Minor Ninth chord (C#m9) is made of C# (the root), E (minor third), G# (perfect fifth, optional), B (minor seventh) and D# (major ninth). The fretboard shows every one of them across the neck in standard tuning (E A D G B E), and plays them back so you can hear the chord.

The minor ninth is a minor seventh with a ninth stacked above, and the fifth is optional. Its notes repeat in several overlapping shapes on the neck. It sits between the minor seventh and the minor eleventh.