Beatles: Rock Band Music Update

Harmonix today announced 15 more of the on-disc songs that will appear in the upcoming The Beatles: Rock Band, organized below for your convenience with the name of the song and the album it was released on.

“Boys”, Please Please Me
“A Hard Day’s Night”, A Hard Day’s Night
“I’m Looking Through You”, Rubber Soul
“If I Needed Someone”, Rubber Soul
“Ticket to Ride”, Help!
“Drive My Car”, Rubber Soul
“Lucy in the Sky with Diamonds”, Sgt. Pepper’s Lonely Hearts Club Band
“Getting Better”, Sgt. Pepper’s Lonely Hearts Club Band
“Good Morning”, Sgt. Pepper’s Lonely Hearts Club Band
“Hello, Goodbye”,Magical Mystery Tour
“Hey Bulldog”, Yellow Submarine
“Dear Prudence”, The Beatles
“While My Guitar Gently Weeps”, The Beatles
“Helter Skelter”, The Beatles
“Something”, Abbey Road
“Come Together”, Abbey Road
“Don’t Let Me Down”, single
“I Want You (She’s So Heavy)”, Abbey Road
“I Me Mine”, Let It Be

In addition, there is a trailer showing off a gameplay video of "Ticket to Ride", which you can check out here.

I was very much hoping that "Dear Prudence" and "Good Morning" would make it into the game, the latter of which has a killer guitar solo. So what is the mystery song?