Metadata: https://www.theverge.com/platform/amp/2019/5/29/18531476/music-industry-song-royalties-metadata-credit-problems

Spotify: https://www.engadget.com/2019/06/21/spotify-overpaid-royalties-songwriters-publishers-crb/

Individualized, curated listening habits: https://techcrunch.com/2019/06/12/we-wont-be-listening-to-music-in-a-decade-according-to-vinod-khosla/amp/