Ideas: Notification for duplicate songs within playlists on web

[Peterwwjd]

I sometimes forget that I have a song already in a playlist and when I add a song already in my playlist it will duplicate it and not let me know its already in a specific  playlist I am choosing to add it.

Moderator Edit: Edited title for clarity

[Indy]

Give us a button to “remove duplicates” from playlists, or an option to sort by song title.