In the Wake of Poseidon is the second studio album by English progressive rock group King Crimson, released in May 1970 by Island Records in Europe, Atlantic Records in the United States, Philips Records in Australia, and Vertigo Records in New Zealand. To date the album is their highest-charting in the UK, reaching number 4. The album was recorded during a period of instability within the band owing to a fluctuating lineup. It follows a musical style and track sequence very similar to their first album, In the Court of the Crimson King. The album was well-received by contemporary critics, who commended the overall execution and production quality as an improvement over that of the band's debut, although later assessments have faulted its heavy reliance on the template established by its predecessor.