Perhaps the most challenging side to the game is on the vocals. To make the absolute most of this mode, you'll often need two, maybe three singers, each with their own microphone, to recreate The Beatles' unique multi-part harmonies and earn the best score. It doesn't matter which singer covers which part of the harmony, as long as all parts are taken care of. That's not to say that a soloist can't have fun on their own, mind you. If SingStar has proved anything, gamers love a bit of a warble, especially with a few drinks in them.
The track-list covers 45 Beatles' songs, all of which are likely to be known to fanatics, while the more casual fans might bemoan some of the more high profile omissions. The especially cynical will point to premium downloads as the sole reasoning behind a lack of Hey Jude (outrage ~ Shocked Ed) or Strawberry Fields Forever, for example. In many cases, the involvement of non-standard instruments seems a more likely cause - you only have to experience the intro to the first piece of DLC, All You Need Is Love, to realise this. In it's Marseillaise opening, you play out trumpet notes with the guitar.
Some of these lesser-known tracks do have the potential to surprise you. No doubt many will reluctantly start up a track they claim not to recognise, only to exclaim "oh it's that song" by the time the chorus or middle 8 kick in.
As part of the guidelines involved with getting the license to the songs, some sacrifices have been made to standard Rock Band functions - no crowd booing on song failure, instruments don't drop out entirely, drum fills are gone. In addition to this, sustained guitar notes can no longer be bent by the player. Sure, you can still wiggle your whammy bar for additional points, but it'll make no difference to the sound you hear, lessening the experience somewhat. That being said, the screaming crowds on the early chapters are a great touch, making up for the fact that they no longer sing along.