Here’s some detail on the money breakout:
Rick Beato: How Creators Killed the Music Business The detail is about a 1/4 to 1/3 into the video, overall the entire video it’s pretty interesting. This doesn’t cover the song writers tho, but Beato talks about that on other videos. Sometimes it comes from the band’s cut of the music. You’ll often hear squabbles inside bands about song writing credits, because bands will divide that money differently. I don’t think there’s any set rules. Some labels will cut different deals with song writers and then basically tell an artist that they are going to play that song.