And it didn't take much, to be honest, as The Beatles: Rock Band footage looks pretty good with whatever Beatles song is put before it. The remaining tracks from "Abbey Road" are available to download as of this week.
Maybe it has something to do with Ringo's moustache. Or maybe it's the option to play "Golden Slumbers"/ "Carry That Weight"/ "The End" but $17 doesn't seem that high a price any more.