The Augmented 9th (aug9) chord is an exciting and edgy chord, known for its vivid sound, making it popular in jazz and some fusion genres. This chord adds a biting dissonance to an already complex dominant ninth chord by sharpening the fifth degree, giving it an augmented fifth. The standard structure of an augmented ninth chord is a root, major third, augmented fifth, minor seventh, and a raised (augmented) ninth. Often, this chord is seen as a variation of the dominant ninth, but with more tension, providing a strong pull toward resolution. For a guitarist, this added characteristic can be negotiated effectively in improvisation or in compositions that seek to captivate with intricate and chromatic textures.