I also see here a post about undo deletion of track from list, but my suggestion goes further, undo for everything. Give us 5-10 seconds to regret our involuntary decisions :
- Add a playlist when we don’t want ( wwdw from now)
- Delete a track from playlist wwdw ( as the other topic says)
- Add as favorite song/artist/album wwdw. Yes, you can unstar it, but is another way. Same for reverse: delete favorite wwdw
- Share something (song,album,artist) with one person or more wwdw
- Write Private Message to somebody wwdw or what we said was wrong ( option to edit )
- Click next/previous song wwdw, come back to the second of the song we were listening before that click
- Give more ideas !
So a button not just to undo deleting tracks from playlists, but basically to revert any action in the app? Nice suggestion,@walker ! 
Passed it on, and left the customary vote
Hi, I like your idea, you have my vote.
Thanks for supporting this idea@pawllo01 that's the spirit of our community!
Its very good idea! You have my vote.
Its very good idea! You have my vote.
Thank you!