The rules are simple the next song you choose must begin with the last letter of the previous for example Love Me Do next song OB-LA DI, OB-LA-DA and so on and so on. You may use any Beatles song or any from their career from before they were famous and during their solo careers as long as it features at least one Beatle it's allowed. Also any song written by a Beatle is also permitted even if they never recorded it.I hope that make sense. I'll start with
Yellow Submarine