Thanks for spelling Beatles correctly.
I am still a gigging musician. Yes, performers commonly get sick and tired of the songs. Our keyboardist once chatted with Randy Owen, lead singer for Alabama. He asked Mr. Owen how much fun it is to play Feel So Right. Mr. Owen said "Pat, I just finished a 350-concert tour. I'd be happy to never sing it again."
That said, regardless of how I feel about a song, when the audience floods the dance floor with smiling, bouncing faces, little do they know that I am having WAY more fun than they are.
And finally, I'd like to point out one of the secrets to the explosive popularity of the Beatles. By the time anybody heard a Beatle recording, those guys had toured Germany twice. For 3 years they did three things each day. They played music, they slept and they ate. In that order. Some days they spent considerably more time playing than sleeping. Most days, I suspect. They were one of the tightest, most polished bands you will ever hear. To this day, they probably had the finest vocals of any band, period. There is a reason you hardly ever see a band cover a Beatle song.