We’re already aware that Harmonix is planning to introduce a yet-to-be determined fee (said to be under $5) for transferring your entire Rock Band 1 repertoire to Rock Band 2. However, what’s bugging us are Harmonix CEO’s words “most tracks” when announcing the feature on stage at the MS E3 Press Conference. Thanks to Joystiq, we now know the reason behind this. Find out about it after the jump.

During a recent chat with Rock Band 2 senior designer Dan Teasdale, Joystiq learned that an unspecified number of tracks, though a separate source revealed that “it should only be a couple songs,” will not be transferable to the sequel, due to licensing issues; presumably the reason as to why Rock Band 2 players will need to pony up a few dollars for the transfers. The unknown source also divulged that Activision’s exclusive deals with certain musicians, like Aerosmith for example, might prevent Harmonix from including the whole set list from the original game.

Does it bother you if each and every Rock Band track won’t make it into Rock Band 2 by means of transfers?