Recalling the song's creation in his authorised biography, Many Years from Now (1997), McCartney says he wrote "Every Little Thing" in a music room at the London home of Jane Asher, where he was living at the time.
"Every Little Thing" is a rare example of a Lennon-McCartney song in which one member of the partnership was primary composer (here McCartney) but the other sang lead vocal (here Lennon).[REF]