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Neversoft and Activision expressed intentions to release downloadable content more frequently, but this has yet to materialize since the game was released in 2008. Downloadable content was available through the in-game store and includes full album downloads and more regular releases compared to "Guitar Hero III". Most existing downloadable content for "Guitar Hero III" is not playable in "World Tour", due to the lack of having tracks for all four instruments for the latter game. However, with the release of Metallicas "Death Magnetic", the developers were able to prepare the tracks in "Guitar Hero III" to have the required portions needed for "World Tour", and thus these tracks are forward-compatible. Activision has also stated that they are considering a monthly subscription service to deliver downloadable content to users for future games. Most of the downloadable content (152 of 158 songs as of early August 2009) is exportable to both "Guitar Hero 5" and "Band Hero", updated to include new features introduced in those games. However, "Guitar Hero 5" downloadable content is not playable in "World Tour".