During today, the developer Harmonix has announced, on the European PlayStation Blog, full details of the upcoming songs that will arrive within Rock Band 4, from the previous games in the series. The same Harmonix has announced that it is currently in close contact with Sony Entertainment Interactiver to speed up the process.
The program will start with the songs of Rock Band 2 in January, the AC / DC Live Band package in February, LEGO Rock Band in March, Green Day: Rock Band and Rock Band Blitz April, 20 free songs from Rock Band 2 and finally, the Track Pack Vol. 2 Rock Band in May. Recall that Rock Band 4 is available respectively for the PlayStation 4 and Xbox One.