The Missing Link Between Your iTunes Library and the iTunes Store
Yet when you browse the iTunes Store, you see prices on albums and songs. Since iTunes knows what music you own, it should be able to show you which items you have already purchased when you browse the store, instead of showing you prices for songs or albums that are in your library. This is the case for apps in the App Store section of the iTunes Store, and I see this with TV shows (but not movies). Yet this is not the case for music.