Paul McCartney wrote this after helping some friends, including John Dunbar, set up the Indica Bookshop (in the basement was the Indica Gallery, where John Lennon eventually met Yoko Ono), in January of 1966. Paul was the first customer of the shop.
This song was a sort of an homage to lots of authors, including John Lennon, who had already written two books: In His Own Write and A Spaniard In The Works. He also was thinking of the author Martin Amis, whom he had just developed a passion for.
The song is sung from the perspective of an author soliciting a publisher. A "paperback" is cheaper than a traditional hardcover book, and at the time was considered of lower quality and written for mass consumption. The implication is that the writer isn't all that good.
See your Spotify stats (with number of plays and minutes listened) and discover new music.
Music data, artist images, album covers, and song previews are provided by Spotify. Spotify is a trademark of Spotify AB.