Songwriters? Yes.
Recording Artists/Musicians? Yes. Real innovators. George Martin shares credit too.
Live playing? Maybe..
As soon as you bring live performances into the discussion, the parameters may change. The problem with the Beatles in concert is that thier great live recordings (Hamburg '62) are only available in lo-fi. I think they kick serious ass, I love 'em to death; exciting and raw and powerful. But, understandably, nobody wants to give 'em a serious listen for the painful fidelity. And so it's come down to common thinking that the cleaner recordings made during the Beatlemania period are as good as they got live. But by that time, the pressures of global success and worldwide touring etc., had instilled a certain cynicism and with it the feeling that they had made it and didn't need to bust thier ass in front of people who couldn't hear and didn't care what they sounded like.
It's interesting to think what might have happened if McCartney's idea to go back on the road anonymously with the Fabs was taken seriously in '69. He brought this idea up to the band right around the time of Elvis' amazing comeback special, which brought the King face to face with a live audience for the first time in almost a decade, with mindblowing results, I think Macca was inspired, and hoping to reconnect and plug into the exact same kind of energy Elvis had found. It gave Elvis a new artistic lease on life, which is exactly what the Beatles were looking for at the time. Imagine what those shows might have been like.