I recently found a particularly rare/esoteric song on Google Play Music, specifically because I wanted to hear more like it. The song was "Light" by Idyllic. I

I recently found a particularly rare/esoteric song on Google Play Music, specifically because I wanted to hear more like it. The song was "Light" by Idyllic. I clicked "Start radio" and the first song was "light", of course. Then all the next 10 songs were by Idyllic only, no other artists. After that half the songs were Idyllic, the other half were....songs from my "Thumbs Up" playlist (any song I had previously liked). I repeated the process several times thinking there was a bug mixing in my thumbs-up playlist. Eventually I realized I'm the first person to ever listen to this song on Google Play Music and it used only me as the first bayesian filter - so I just got my own music suggested back to me.