Greyed out tracks, ok some of them down to licencing, if you check itunes could be album only etc, so greyed out of tracks make sense in most cases, but they don't in playlists, https://itunes.apple.com/gb/playlist/kate-bush-ultimate-tracks/idpl.56c0bb4aabbf4e4584bb6fd5ba6c4456 , hope that link works, see the tracks are greyed out from two albums, those two albums are on all other streaming sites
Yeah, I might get frustrated and not agree with licensing restrictions, but I accept they exist and there WILL be SOME albums/songs simply not available or not available in certain countries due to it, but as pointed out on this thread, licensing doesn't explain things like "All These Things That I've Done" by The Killers being greyed out on the "Hot Fuss" album, but NOT greyed out on "Hot Fuss (Deluxe Edition)" or their greatest hits album.
It also doesn't explain why track 7, "Face For The Radio" on the album "Hats Off To The Buskers" by The View is greyed out here in the UK - they're a UK band, every other track on the album is available, it's not a track marked "Explicit" and every song on the album is written and produced by the band and it's not even one of their big hits. Why would such a song be greyed out?
It CAN'T be licensing in the cases above, surely?