1979’s “All of My Love” by Led Zeppelin is a rock ballad co-written by the band’s lead vocalist, Robert Plant, and Zeppelin’s bassist John Paul Jones. The tune was written in honor of Plant’s son, who tragically died of a sudden illness as a pre-schooler. From PopMatters‘ review: “the saddest and most heartfelt Zeppelin song … which hauntingly enough sounds like a foreshadowing of a band on the path to an impending and unforeseeable dissolution.” Indeed, the hugely popular band broke up the very next year in the wake of drummer John Bonham‘s death.
A direct whole-step modulation hits at the 4:25 mark.