I want to know the answer to the following question:
Led Zeppelin's first two albums both came out in what year?
All the background I'm provided with is that "By the end of the decade a distinct genre of hard rock was emerging with bands like Led Zeppelin, who mixed the music of early rock bands with a more hard-edged form of blues rock and acid rock on their first two albums". Is that enough to answer the question?
Answer: no