When you say all your songs are gone, what do you mean by this? Do you see your playlists?
I am a little confused here.
So, you can see your playlists however, no songs are displaying in the playlist?
You say they are not your songs, did you create this playlist? Or was it created by someone else?
If the playlist was created by you and is now gone, you can recover it from here:
If it was not created by you, you must of unfollowed it, you would just have to search for the playlist again.
Hope this helps.
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