Without a doubt in my mind, it's Rock Band: The Beatles II. With an option to export all RBTB songs with keys support added, along with new songs. Have you wondered why the last DLC was Rubber Soul?
MY PROPOSED SETLIST (60 songs):
Please Please Me:
Chains
Please Please Me
Love Me Do
With The Beatles
All My Loving
Money
Don't Bother Me
Roll Over Beethoven
'til There Was You
A Hard Day's Night
And I Love Her
Any Time at All
I Should Have Known Better
Beatles for Sale
Kansas City/Hey-Hey-Hey-Hey!
No Reply
What You're Doing
Help!
The Night Before
You've Got to Hide Your Love Away
You're Going to Lose That Girl
I've Just Seen a Face
Yesterday
Dizzy Miss Lizzy
Revolver
I'm Only Sleeping
Got to Get You Into My Life
For No One
Magical Mystery Tour
Your Mother Should Know
Penny Lane
Baby You're a Rich Man
Magical Mystery Tour
The White Album
Yer Blues
Blackbird
Everybody's Got Something to Hide Except for Me and My Monkey
Happiness is a Warm Gun
I Will
Martha My Dear
Mother Nature's Son
Piggies
Honey Pie
Wild Honey Pie
I'm so Tired
Why Don't We do it in the Road?
Yellow Submarine
Only a Northern Song
It's All Too Much
All Together Now
Let it Be
Two of Us
The One After 909
For You Blue
Let it Be
The Long and Winding Road
Past Masters
HEY JUDE
Get Back
The Ballad of John and Yoko
She Loves You
I'm Down
Long Tall Sally
From Me to You
LOVE
Strawberry Fields Forever
Anthology Series
Ob-La-Di, Ob-La-Da
Besame Mucho
Not Guilty
If You've Got Trouble
Come and Get It