Wonderful Christmastime - Paul McCartney (1979) This Christmas song was recorded during the sessions for the McCartney II album, where Paul once again retreated to his farm and laid down all the tracks himself. This time he was experimenting with the new electropop movement, which explains the weird boinging sound throughout the song. This sound was created by an early synthesizer called a Sequential Circuits Prophet-5, which was also used on Kim Carnes' "Bette Davis Eyes" and the Doobie Brother