The Beatles

His political activism first attracted the attention of the FBI in late 1971.

On March 21, 1961, The Beatles played the Cavern Club at night for the first time. “We used to play lunchtime dates” George Harrison recalled. “We’d get up and go down to the Cavern and play from noon till about two. It was very casual.

The footage actually came from sessions for "Hey Bulldog," which was still unreleased at the time.

He conducted the strings on 'Eleanor Rigby,' played piccolo trumpet on 'Penny Lane' and wrote brass, violins, cellos and vocal arrangements for 'I Am the Walrus.' Read Paul McCartney's words about "the passing of dear George Martin".

The man known as the "Fifth Beatle," producer and arranger George Martin, has died at the age of 90.

This controversy sparked death threats, becoming one of the reasons why they decided to stop touring.

They'd barely any time to reflect on their history-making first journey to America before moving on to the next project.

One of the perks they had to get used to was rubbing shoulders with the rich and famous.

It was only two days after their first appearance on 'The Ed Sullivan Show.'

Artists used to bang out killer albums in a hurry.

The world of rock music – and American culture in general – was turned upside down.

Third part of the equation that would become the Beatles fell into place.