Conversation so far:
What is the British Invasion in music?
The British Invasion was a cultural phenomenon of the mid-1960s, when rock and pop music acts from the United Kingdom and other aspects of British culture, became popular in the United States and significant to the rising counterculture on both sides of the Atlantic.
What era did the British Invasion in music happen?
The British Invasion was a cultural phenomenon of the mid-1960s
What genre did British Invasion involve?
rock and pop music

Question: What is so special about it?
Self-contained rewrite: What is so special about British Invasion?