Build spotify playlists from saved music based on their genre.
genify groups saved spotify songs into playlists based on their genre.
There are a couple properties in the Spotify Web API which appear to allow this. The album object has a genres property which would be sufficient, however not one of the albums in my library have this field populated.
The artist object also has a genres property. 90% of the artists in my library have this field populated. This is the current method genify uses to categorize tracks.
The EchoNest used to have a good API for this (the Artist/terms endpoint). Spotify has since bought
them out and mostly integrated it into their current API.