3-chord shape progression (e.g. Am → F → F7; C♯m → A9 → A13)
Song count per year
% of each member's catalogue with this tag (by writing credit)
Updated
Book
All the Songs
Margotin & Guesdon
Sheet music
Musicnotes – Beatles Piano/Vocal/Guitar
Musicnotes
Book
The Beatles: Complete Scores
Hal Leonard
affiliate link – supports this wiki