You might be interested in a project I shared here on HN recently to create weekly spotify playlists automatically for each of about ~100 music subreddits, using the most popular submissions in the last week.

The main project page with a link to all the playlists is here: https://jameslawlor.github.io/reddit-playlists/

Code on Github: https://github.com/jameslawlor/reddit-playlists