A Minor Ninth chord (Am9) on the guitar fretboard

The A Minor Ninth chord (Am9) is made of A (the root), C (minor third), E (perfect fifth, optional), G (minor seventh) and B (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.