 "Jenny Wren" was written in Los Angeles, and is about a character of the same name from Charles Dickens' 1865 novel "Our Mutual Friend".It also refers to a bird known as the wren, which is reported to be McCartney's favourite.McCartney wrote the tune in the same sort of finger picking style found in "Blackbird", "Mother Nature's Son" ("The Beatles") and "Calico Skies" ("Flaming Pie").