I don't have experience with GH:WT (because it and its creator company both blow monkey chunks) but with Rock Band they don't show up as track packs. All of the songs contained within the track pack are listed individually. So, for example, The Who album is not listed as "The Who Album Track Pack." "Baba O'Reilly by The Who" is an example of how the content within the pack is listed in the game menus.
If you can't find the songs this way, then it may just be that Red Octane/Activision/Neversoft are finding more ways to rip off their customers beyond just the very product itself.
