Paperback Writer - The Beatles Easy Guitar Lesson - Learn It In 5 Minutes (Guitar Tab & Chords)
Written primarily by Paul McCartney this is a really effective guitar riff derived from G with a two chord progression of G to C
The Beatles 1962 - 1966 Red Album Guitar tab book says to tune this one down one whole step. This would mean the riff is played in A. The chord progression being A to D
In the Paperback Writer video John Lennon can be seen quite clearly playing barre chords G and C on his Epiphone Casino