iOS 7 Finding - "Album Artist" required for Artist to show up in list
When I loaded my playlists to my iPhone withe the newly installed iOS 7 Beta, I did not find all my artists in the music library. But searching on artist name made them show up. After some digging I realised that Apple now use the "Album Artist" field in the MP3 Metadata instead of the "Artist" field as in iOS 6. But this is probably intentional !