Spotify is working on mixing tools that would allow users to remix songs on the streaming service, according to screenshots captured by tech veteran and app researcher Chris Messina. While music aficionados use software like Adobe Audition or Ableton Live to create mixes of their favorite songs, the new capabilities would allow people to do so directly in Spotify. The screenshots indicate that the mixing tools would be available under a new “Music Pro” premium subscription tier. The news was first reported by The Wall Street Journal, whose sources say discussions about the tools are early and that licensing agreements have not been worked out yet.