Interesting release, and am very interested as a musician where this leads. Not for Spotify’s sake, but because tools like this are super useful for people who have the ideas in their head, but not the musical background to get a simple tune to work the exact way you want.<p>The one worry I have and perhaps I am naïve to what the implications of the license are, but do the rights to the tune being processed on the web version of the converter stay with the person inputting the vocals or instrumentation, or does the midi get catalogued by Spotify?<p>It would seem if you are grabbing the source code you don’t have to worry about something like that, but I’m more curious with what they do with the sound file while processing it on their side. Does it go into their research for their recommendation engine? Or is this purely altruistic?<p>I want to believe the latter, but Spotify’s own track record on respecting artistic work, especially in adequate compensation for use of artist’s work if it brings ears to their platform leads me to believe that while not nefarious, they are certainly getting more out of this than good press.<p>If I’m just being a cynic about this, please call me out on it. I understand that I am jaded on this subject in particular, and might be a place where I am quite biased against Spotify and what I see as their furthering of negative traits in music.