Rather than having duplicate songs on spotify and getting into our libraries and playlists, a song that shows up in multiple albums should just be saved with multiple albums listed to it. The 'go to album' option could go to the most prominant album, or show all albums it is in.
Basically if you've saved a song from one album, than go to the songs single or other album it's in, you'd see it is already saved, and would be notified if you try to add it to a playlist that it's already in.
Updated on 2020-05-10
Your Idea has been submitted a while ago, and unfortunately hasn't gathered enough votes (100 per year) to keep it active in the Exchange. Be sure to know that this does not mean that your Idea has been declined by Spotify.
If you still feel strongly about your suggestion, we encourage you to develop your Idea and post it again, with a link to the original one, to give it a chance to gain more votes.
For more info on how the Ideas Board works, click here. 🙂