I have a Siri+Songza music recommender, which automatically understands your language, intent and mood, as in:
"music to fall asleep to"
"instrumental music for dinner party"
I have a basic tech demo here: www.themuko.com
In the future, I will adapt result based on your taste, after seeing your playing habits over time.
Do you think Spotify users would like it? Should I implement it for Spotify users?