Final answer:
The Beatles appeared on The Ed Sullivan Show on February 9, 1964, which was a pivotal point in music history and helped popularize the band in America.
Step-by-step explanation:
The British rock band The Beatles made their groundbreaking appearance on The Ed Sullivan Show in the early 1960s. This event marked a significant moment in music history, introducing the band to a much wider American audience and helping to kickstart the so-called British Invasion of the US music scene. While the exact date of this appearance isn't provided in the reference information given, historical records show that The Beatles' legendary performance on The Ed Sullivan Show took place on February 9, 1964.