The Beatles first performance on Sullivan was by no means flawless. They were nervous and in the middle of a publicity whirlwind. What got them through was their skill as ensemble musicians.
The Beatles were an overnight success that took years of hard work. They played every gig they could lay their hands on. Hamburg, Germany was the place where the band we know came together. Stu Sutcliffe left and Paul took over the bass spot. This was an important change that many people overlook.
Paul was born to be a bass player, He not only had all the necessary tools but he would bring a guitar like fluidity to the electric bass. George and John no longer had to double rhythm parts. Freed from having to cover for Sutcliffe, John And George developed clearly defined roles that became a big part of the Beatles sound. John's powerful rhythm Guitar and George's lyrical approach provided the contrast that had been missing.
Ringo would be the final addition to the Beatles sound. He had a great groove and his remarkable consistency both live and in the studio gave the Beatles the solid foundation they needed to push the musical envelope.
1963-1966 are the the Band years. Their cohesion and sound were forged by constant live performing. They took full advantage of that by recording their first album Please Please Me in a long ten hour session.
The albums fourteen tracks were recorded "Live" in the studio. The band vibe that permeates the record would continue with their other recordings until the release of Rubber Soul. From that point on the music would grow beyond what guitars, bass and drums could produce.
The groove continues...