The beatles back catalog feels so generic. Especially when you start hearing contemporary to that period music (the animals etc). All short sweet songs, using generic pop music chord structures and lyrical themes for the most part. Not to do them any discredit, they did come up with those lyrics but they did not come up with the chord structures or lyrical themes. They picked them because they knew they would be popular. They went up and did literally what elvis did to get his fame: rehash known good pop music with a pretty boy (or four) marketed to young girls ensuring capture of the youth market for a generation. And boy were the beatles marketed moreso than a lot of artist at the time and a long time afterward.