sentences:  Prior to "Guitar Hero 5", downloadable content for earlier games will not work in other games in the series, save for songs from Metallica's "Death Magnetic", which were available for "Guitar Hero III", "World Tour", and "Metallica".Existing "World Tour" downloadable content for "World Tour" will be forward-compatible with "Guitar Hero 5", "Band Hero" and "Guitar Hero Warriors of Rock", and for a small fee, some songs from both "Guitar Hero World Tour" and "Guitar Hero Smash Hits" can be exported to both "Guitar Hero 5" and "Band Hero", limited by music licensing.Activision has also stated that they are considering a monthly subscription service to deliver downloadable content to user for future games.