Fmaj9 is a major ninth chord made of 5 notes: F, A, C, E, G. It sounds rich and floating, and you hear it in jazz, R&B and cinematic pop. It is the I chord of F major and turns up in 3 other keys.
The library above opens on Fmaj9 with 14 shapes up and down the neck. Tap a shape to hear it, or play it one string at a time.