Addie and I have created a large playlist of all the tunes we currently like.

Oftentimes, we will want to put on a mood - currently either bops or softs.

Bops are for when things are good. The kids call them bangers. Think a boisterous Friday evening.

Softs are for when things are mellow. The kids call them chill tunes. Think a hungover sleepy Saturday morning.

There was no way for us to put on one mood of songs we currently like. We had to skip softs when we were in a bop mood and bops when we were in a soft mood.

Enter Spotify Splitter.

Spotify Splitter splits a large playlist into bops and softs based on a separation algorithm.

Spotify characterizes all of their songs with various criteria called Audio Features.

Using these, we can run each song through a filter to determine if it is a bop, a soft, both, or neither.

A rudimentary, pseudocode filter may look like:

if song['danceability'] > 0.7:
    bops.add(song)
if song['energy'] < 0.45:
    softs.add(song)

The current sorting algorithm can be found on the spotify-splitter.py file.

To run this on your own playlists:

1. Go to your Spotify for Developers Dashboard (SfDD).
2. Create an account if needed.
3. Create a new app and call it "Spotify Splitter."
4. Edit the "Spotify Splitter" app's settings and add an entry to "Redirect URIs": http://localhost:8080/. Be sure to save!
5. Create a .env in the base spotify-splitter/ folder with the following environment variables:

• SPOTIFY_CLIENT_ID: your client id from the SfDD
• SPOTIFY_CLIENT_SECRET: your client secret from the SfDD
• SPOTIFY_REDIRECT_URI: http://localhost:8080/
• SPOTIFY_USER: your spotify username, as written on your Spotify Account page
• MAIN_PLAYLIST_ID: the playlist id to split; you can find it on the Spotify Web Client in the url: https://open.spotify.com/playlist/<playlist_id>

6. Curate the sorting algorithm to your liking. Refer to the Audio Features page for more sorting criteria.
7. Change the Playlist objects' initialization (playlist_name) to your liking.
8. Run the spotify-splitter.py script.
9. You may choose to run this on a cron job in order to keep updating your playlists on a regular basis. We run ours daily at midnight.

You will have to authorize your Spotify account on first run.

Enjoy your split music!