Part 4/9:
For the chorus, Beato introduces an old friend, drummer JJ Zeller, to shed light on the percussion and groove. JJ emphasizes how the drums in "Back in Black" stick largely to straight quarter notes, providing a steady backbone, while the guitar riffs add a layer of rhythmic complexity through syncopation. He points out the interesting "four against three" feel created by the guitar accents against the simple drum pattern—a hallmark of AC/DC's style.