2-chord progression
Song count per year
% of each member's catalogue with this tag (by writing credit)
as A7 → C
as A7 → C
as A7 → C7
as A7 → C
as A/C♯ → C
as A7 → C7
as A7 → C
Updated
Book
The Beatles: Complete Scores
Hal Leonard
Sheet music
Musicnotes – Beatles Piano/Vocal/Guitar
Musicnotes
Book
All the Songs
Margotin & Guesdon
affiliate link – supports this wiki