One thing that i just found in iOS 5 is that in the new Music app, sorting is done by album artist not just artist. Finally this app is useable again. Before my artist list was clogged with hundreds of artists that appeared once on a compilation. This was the most frustrating feature of previous iOS. This change brings it back in line with the old iPod classic sorting. (compilations tagged with actual artist name in "artist" field, compilation compiler as "album artist", with "part of a compilation" checked).