There is none of it. The economy of the music industry breaks down much like the wealth disparities in the United States. You are either immensely rich (see: Max Martin, Jay-Z, Lucian Grange), or you are part of the 99% more-or-less living from year to year, month to month, or even week to week.
Over the past years, it's become more clear that music streaming is a part of the music industry's future, but even the big players like Spotify, SoundCloud, and Tidal are still struggling to figure out a balance between pleasing consumers and carrying out a sustainable business plan. For now, it feels like everyone is losing.