I would love it if, when you add a song to a playlist it tells you that it's already been added before. Like let's say I find a song that I like but it's already in my "Favorites" playlist, then before I add it to the playlist it alerts you that, that song is already in said playlist and would you like to add it again. Maybe even when you pull up the song it tells you before you even try to add it that, that song is in your "favorites" playlist so you don't even try to add it again. That would be super helpful as I have a playlist that is well over 350 songs and it's hard to keep track of what songs I have already added. It may also be helpful to have the option to search within a playlist to find that song in that perticular playlist and not have you just search in general even if your i
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