This guy's inability to fathom that there exists music outside of Rock is bordering on hilarious. Not to even mention the entire world of music before Rock, which is especially hilarious given him citing musical history. Does he think Nat King Cole or Ella Fitzgerald wrote their own music?

I mean if you're stupid and don't know about the history of say rock and roll, let alone music. Artists in the 60s and 70s like the stones, Beatles, hell even newer people like Nirvana, foo fighters, etc. Write all their songs, most even do their own editing and mixing. The Beatles didn't have a hundred people in the studio writing and mixing while they sipped margaritas and got their nails done.

Dude there are literally documentaries about musicians and the writing process, and they didn't always involve 100 people.

Edit: just want to look at my albums. So many like Metallica, all songs written and composed by the members of the group. Go look at the credits just for song writers in a Beyonce album, there's like two dozen writers