Final answer:
The Beatles' most famous and legendary concert is often considered to be their performance at Shea Stadium in New York City on August 15, 1965.
Step-by-step explanation:
The Beatles' most famous and legendary concert is often considered to be their performance at Shea Stadium in New York City on August 15, 1965. This concert is significant because it was the first time a rock band had performed at a stadium, and it set a precedent for future stadium shows by popular artists.
At Shea Stadium, The Beatles played a 30-minute set to a record-breaking crowd of over 55,000 screaming fans. The excitement and hysteria surrounding the concert demonstrated the immense popularity and influence of The Beatles during the height of Beatlemania.
This concert is often cited as a milestone in music history and marked a shift in the way concerts were perceived and organized.