I wonder if this just has to do with uniqueness of those songs in comparison to the the Max Martin pop formula output we have today. The Beatles' music, while I

I wonder if this just has to do with uniqueness of those songs in comparison to the the Max Martin pop formula output we have today. The Beatles' music, while I'm not an enormous fan, is notably unique in chord progression and tempo. A lot of today's pop has little variation because the industry knows the formula works.