Before a live performance of the song on December 14, 1969 (as shown in the live album Epitaph), Fripp remarked that the song was dedicated to "an American political personality whom we all know and love dearly. His name is Spiro Agnew."
In his live shows, Mercer is known for lengthy drum solos (often during April Wine's cover of King Crimson's "21st Century Schizoid Man") which frequently include a strobe light show.
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"21st Century Schizoid Man" is a cover of the King Crimson classic, which appeared on that band's 1969 debut, In the Court of the Crimson King.