Pay attention to the instrumentals and vocals here. The Drifters were a cross-over from doo-wop to R&B, with the vocals striking a balance here. The music has a hint of soul with a large production number, and that intrusive guitar kicking in towards the end gives a nod to rockabilly. At this time, Motown was just firing up with its new soul sound, and Mike Stoller reports in Hound Dog: The Leiber & Stoller Autobiography
, "Some say Sam Cooke invented soul music in the fifties, and some say Ray Charles. Some say soul didn't come about until later, in the sixties, with the advent of Otis Redding and Aretha Franklin. Others have told us that our productions for the Drifters began it all. Who can say?"
It's no surprise, then, that Berry Gordy came to see Jerry Leiber at his Brill Building office right before this song came out. Explaining that he wanted to make R&B more appealing to whites by softening the sound, he played some demo tapes for Leiber. Gordy then offered him a partnership. But Leiber turned him down, telling him, "You don't need me. You have everything you need. Just go back to Detroit and do it."