A♭7
A♭ Dominant 7th · 4 fingerings
The dominant seventh adds a flat seventh to the major triad, and that interval against the major third is what creates its restless, bluesy pull. A♭7 is the engine of blues, where whole progressions are built from dominant chords, and it's the classic V chord that drives a resolution home in jazz and pop alike.
A♭7 · position 1
A♭7 · position 2 · fret 4
A♭7 · position 3 · fret 6
A♭7 · position 4 · fret 11