It's absolutely impossible for me to narrow it down to one but here are some of them.

A Day In The Life
A Hard Day's Night
Back In The U.S.S.R.
The Ballad Of John & Yoko
Can't Buy Me Love
Come Together
Day Tripper
Don't Let Me Down
Drive My Car
Eight Days A Week
Eleanor Rigby
From Me To You
Get Back
Happiness Is A Warm Gun
Help!
Here Comes The Sun
Hey Jude
In My Life
Lady Madonna
Let It Be
Money (That's What I Want) (cover)
Paperback Writer
Revolution
She Loves You
Something
Strawberry Fields Forever
Ticket To Ride
While My Guitar Gently Weeps
Yesterday

write in any Beatles' song here __________