Copyright

Katy Perry / Flame (Aug 2019): https://www.kqed.org/arts/13863015/perry-dark-horse-flame-joyful-noise-copyright-infringement-precedent

Robin Thick / Marvin Gaye (2015): https://www.theguardian.com/music/2015/mar/10/blurred-lines-pharrell-robin-thicke-copied-marvin-gaye

Words or music? Gershwin v. Gershwin: https://www.latimes.com/entertainment/arts/la-ca-gershwin1-2009nov01-story.html