Shuffle uses a limited list that rarely gets updated, but not just the 100 most recent ones. You can force it refresh by turning off shuffle and force closing the app.
This is an EFF project that allows you to understand how easy it is to identify and track your browser based on how it appears to websites. Anonymous data will be collected through this site.
It's just the most 100 recently saved songs. The fuck. (startrek.website)
Cover Your Tracks: Test how well your browser protect you from tracking: (coveryourtracks.eff.org)
This is an EFF project that allows you to understand how easy it is to identify and track your browser based on how it appears to websites. Anonymous data will be collected through this site.