Duplicate warning works on app but not web!  I listen all day long on the web at work.  This is so problematic!  I am a premium user also.  Your support has ignored this problem as of today.   If you happen to save a song that is already in your playlist, the web interface will allow you to add a duplicate song.  The iOS app will reply that "the song is already in playlist, add duplicate?". Would be great if that same feature existed on the web version.  MY SOLUTION ON DUPLICATE -  I use the web for playing - but use my app utilizing search option for song and then add to playlist to help curb the duplicate adds - sad it takes so much effort.  SORTING:   Playlists and some content is still not allowed to sort alphabetically resulting in creating even more duplicates.   SOLUTION:   When you expand the song details and have options Collect/Download/Share/Add to Playlist/Start Station/Add to Queue - CREATE a button that shows a tag or link trail of where this song appears in your profile - giving the option to remove etc!   Please keep improving your products... lots of complaints on these two topics.    ... View more