The number of wearables is increasing year after year. Smartwatches and smartbands allow us to have a log of our lifestyle: calories, activities, steps, floors up/down, music & controls,….and pulse. So I thought, maybe you can access wearable HRM to determine a behaviour in Deezer’s app.
I mean: if someone is listening to a song, from a playlist or flow, and Artificial Intelligence detects that pulse is higher, then that person loves that song! S/he is feeling it, and Deezer add it to favorites automatically. By contrast, if pulse rate decreases, i’m afraid that song will move to a better life and algorithm won’t recommend again. Finally, if it remains stable, it can be translated to give that song another chance, so automatically add to a review list.
As always, this things require user approval and even user can personalize those automatic actions.
P.D: what if that person doesn’t have a wearable? nothing, at least in this way, because system can’t have any pulse data. Maybe , IA can use other ways to identify what happens to him/her.
Automatic actions according to your pulse
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Definitely thinking out of the box with this one@walker and would be a cool feature 
(would need lots of work though to develop an accurate AI)