Conversation so far:
When was Led Zeppelin IV released?
CANNOTANSWER.
How successful was it?
The album was a massive instant seller.
It entered the UK chart at No.
10, rising to No.1 the following week and.
How did it do after it's first week?
and stayed on the chart for 90 weeks.
In the US it stayed on the charts longer than any other Led Zeppelin album.
How were the reviews?
Led Zeppelin IV received overwhelming praise from critics.
Where there any bad reviews?
Even though he found their Medieval ideas limiting as usual.
What did some of the positive reviews say?
but later called the album a "genre masterpiece", and wrote that it showed the band at the pinnacle of their songwriting.

Question: Anything else interesting?
Self-contained rewrite: Besides Led Zeppelin IV receiving overwhelming praise from critics, anything else interesting?