The dominant 9th chord is a staple of jazz, blues, funk and soul, where its added ninth softens the bite of the dominant seventh while keeping its pull toward resolution. Arpeggios like this one are a standard practice tool for guitarists, pianists and other musicians learning chord tones, and they are widely shared online as short reference clips for lessons, ear training and songwriting. Because the sound is instantly recognisable as jazzy and forward-moving, creators keep returning to it for transitions and musical demonstrations.