murphy7801 said:
yes but they make alot money from the using of those songs if want to lose even more money ?
...but if Activision cut support, then Sony would already lose a substantial amount of money. If Sony cut support from Activision, then Activision would be the one to reconsider.
Look at the song list in Guitar Hero 1 [http://en.wikipedia.org/wiki/List_of_songs_in_Guitar_Hero]. Now look at the list of Sony owned labels [http://en.wikipedia.org/wiki/List_of_Sony_BMG_labels].
Now click on every band in the song list and look at their "Label(s)" tab to the side. If one of those labels is owned by Sony, then that band is effectively out of the Guitar Hero franchise. I already have Motorhead, Ozzy Ozbourne, Audioslave, Blue Oyster Cult, Franz Ferdinan, and Black Sabbath. And that's only bands from the first Guitar Hero.
EDIT: And after looking into more of these, Sony
just through Legacy Recordings [http://en.wikipedia.org/wiki/Legacy_Recordings] has AC/DC, The Allman Brothers Band, Louis Armstrong, The Bangles, Johnny Cash, Bob Dylan, Earth Wind & Fire, Men at Work, Blue Öyster Cult, as well as others. Some of them are debatable, but yes, Sony owns alot of bands and songs.