Rock Band owners interested in the new track releases of Beatles: Rock Band may be in for a slight disappointment. Unfortunately, downloadable content for Beatles: Rock Band will only be playable exclusively to that title. Further adding to the separation of the two disks is the exclusion of the export feature, so Rock Band tracks will not be playable on Beatles: Rock Band and Beatles: Rock Band track will not be playable on Rock Band.
While hardcore Beatles fans will probably look past the monopolizing scheme, what looks to be the bigger peeve for fans of Rock Band is having to switch out the disks. This can be attributed to laziness but, when it comes to music, avid listeners are very promiscuous and will probably want to switch back and forth between artists.
[Source]
