While not advertised much, Songlytics for Spotify crawls your playlists once a week and update the list of songs tracked for you. This wasn’t a big deal a year ago, but now there are enough users that this process takes more than a week! to complete. Spotify rate limits Songlytics, so I’ve chosen to only update your playlists if you’ve played something in the past month. If you haven’t logged a new play in the last month, Songlytics should stop updating your Spotify playlists.
In other news, the Songlytics service is now tracking of 29 million different songs for our users! I look forward to seeing how this project continues to grow. Keep tracking those ratings and play-counts!