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.

Question: Was the album a success?
Self-contained rewrite: Was "In the Wake of Poseidon" a success?