This is the opening section of the title track from King Crimson's third album. The entire piece is about a prince taking part in an epic battle. It lasts 23 minutes, 15 seconds, making it the longest composed recording by King Crimson.
This opening song features Yes's Jon Anderson in his only ever contribution to a King Crimson recording. Anderson was invited to sing on the track as it was out of King Crimson vocalist Gordon Haskell's range.