I would argue that it has waxed and waned. 50s most music was written by a composer. Have a songwriter behind a big name like Frank Sinatra. 60s has a surge of

I would argue that it has waxed and waned. 50s most music was written by a composer. Have a songwriter behind a big name like Frank Sinatra. 60s has a surge of bands producing their own music in a smallish crew (Beatles, Beach Boys). But then arena rock was tightly controlled by the industry, but then Nirvana and grunge got big.