Spotify doesn’t actually use a single revolutionary recommendation model. Instead, they mix together some of the best strategies used by other services to create their own uniquely powerful discovery engine.
To create Discover Weekly, there are three main types of recommendation models that Spotify employs:
- Collaborative Filtering models (i.e. the ones that Last.fm originally used), which analyze both your behavior and others’ behaviors.
- Natural Language Processing (NLP) models, which analyze text.
- Audio models, which analyze the raw audio tracks themselves.