A good example of how their music developed was when Sinatra said "Something" was the greatest love song of the past 50 years. Thats amazing considering all the material he covered. I still play it on piano gigs tied to Yesterday.
There was one local band that came along and they did nothing but Beatles. They had one member , who I worked with years later, who could mimic McCartney perfectly. Similar looks, voice was spot on, and he played bass. They eventually got booked to do A National tour of Trudy Hellers Hullabaloo clubs.