Surprising and unique playlists are curated by Re/ machine learning algorithms. The more music you play with Re/, the better its recommendations become.
You can also train the app and make the algorithms learn your favourite genres and music preferences. Even without moving a finger, the app works with what it has.
The final word is always yours. Dislike specific songs and teach the app to make them less and less played next time you launch it.
Re/ is constantly learning from your listening behaviour, even when you skip songs or adjust the volume. Just launch the app and let it play.