This is a very simple idea for a simple tool which is lacking on music streaming platforms and which, from my experience, would be useful.
A user would be allowed to lock a certain part of the playlist by simply selecting the songs with the mouse cursor. By "lock" I mean that only the selected songs would circle around to be played. So technically it's more about locking the rest of the playlist except from the selected part.
Why would this be useful:
Popular music streaming platforms like Spotify and YouTube allow any playlist to be played either in a successive manner or in shuffle mode. There’s no way for the user to make the software circle or shuffle within the specific part of the playlist. If you want that, you have to do it manually, by stopping and playing certain songs again. Another option is to make a separate playlist with only those songs that you want to hear for the time being and delete it afterwards. But both of those options are not convenient. The described feature would let you make temporal mini playlists within the same playlist. That way you’d be able to juggle with your favorite music more freely.
I often enjoy listening to only the most recent part of the playlist, - the songs that I’ve added to it yesterday or in a few last days or few last weeks, depending. This is not only true for me, it’s a general psychological trend when listening to music – people usually listen to the most recent songs they enjoyed until they get bored of them, then search for something new or…. - dig amongst older songs. So it’s not only about being able to lock the most recent songs. As I explained in this idea, the playlist has a kind of biographical layers in it, the batch of songs that you added during a certain time period is related to certain circumstances in your life and therefore you’d likely want to listen to that specific part of the playlist again at some point, all those songs are likely to provoke similar feelings.
There should also be a possibility to lock a certain batch of songs by selecting them one by one, that way the feature would not be limited to selecting only successive songs from the playlist.