"Who's That Knocking?"

"Who's That Knocking?" (written by Colin Blunstone and Alan Phillips) seems to borrow from Paul McCartney's "Let 'Em In" from a couple years earlier.*  The chorus of "Who's That Knocking?" starts with the lines "Who's that knockin' on my door? / Who's that ringin' on my bell?"  Much of McCartney's song consists of similar sentences but as statements instead of questions:  "Someone's knockin' at the door / Somebody's ringin' the bell."

---

*According to Russo's Collector's Guide, "Who's That Knocking?" was first released as a U.K. B-side (to "Ain't It Funny") on 21 July 1978, and according to McCartney's website, "Let 'Em In" was released as a single on 22 July 1976, although it was also on Wings at the Speed of Sound, released on 25 March.