Conversation so far:
What is the interregnum?
This period has subsequently been referred to as the "interregnum" - a nickname implying that the "King" (King Crimson) was not properly in place during this time.
What is In The Wake of Poseidon?
Fripp and Sinfield recorded the second King Crimson album, In the Wake of Poseidon, in 1970.
Was the album a success?
In the Wake of Poseidon reached No.
4 in the UK and No.
31 in the US.
Was Lizard another album?
the third album, Lizard.
Was that album successful?
Lizard reached No.
29 in the UK and No.
113 in the US.

Question: What genre is the band's music?
Self-contained rewrite: What genre is King Crimson's music?