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

Question: What genre did it involve?
Self-contained rewrite: What genre did British Invasion involve?