A user on Reddit has created a music player that creates playlists based on subreddits.

There are currently over 280 subreddits which you can choose from to play a playlist of the most recently recommended songs from YouTube on that subreddit.

The user, who goes by Illyism, said:

I made it because I liked listening to music on Reddit and wanted a better interface for it. I just select subs I like and hit play and it’ll keep playing for as long as I like.
You can pick any amount of subs you like and sort them similar to how Reddit does and it’ll make a playlist out of that.

You can easily check it out for some interesting playlists here.