The idea is to implement a tool which lets you watch all the songs which have been in the Playlist so far.
So maybe it helps you to find a song that you like and want hear again but it is not longer in the playlist and you can't remember the name of the song so you have this tool and can look for all the songs which have been in this playlist so far and maybe find the wanted song
Updated on 2020-04-03
Thanks for bringing your feedback to the Idea Exchange.
Similar ideas have already been suggested - feel free to add your vote to them:
If you had something more specific in mind, feel free to submit your idea again in a slightly different form.
More info on how to search for existing ideas in the Idea Exchange can be found here.