Conversation so far:
What was his background?
CANNOTANSWER.
Are there any other interesting aspects about this article?
By 1966, the Beatles had grown weary of live performance.
Who were the performers?
George Harrison.
When was it created?
In June that year, two days after finishing the album Revolver.
What else was they known for?
While in Hamburg they received an anonymous telegram stating: "Do not go to Tokyo.
Your life is in danger".
What happen after that?
The threat was taken seriously.

Question: What did they do about it?
Self-contained rewrite: What did Sgt. Pepper's Lonely Hearts Club Band do about threat