Muzycy Robert Fripp – gitara, dodatkowe instrumenty (wszystkie utwory) Adrian Belew – gitara, główny wokalista (w: "Discipline", "Thela Hun Ginjeet", "Matte Kudasai", "Three of a Perfect Pair", "Frame by Frame", "Sleepless", Heartbeat”, "Elephant Talk") Bill Bruford – perkusja (w: "Discipline", "Thela Hun Ginjeet", "Matte Kudasai", "Three of a Perfect Pair", "Frame by Frame", "Sleepless", Heartbeat”, "Elephant Talk", "Red") Tony Levin – Chapman Stick, gitara basowa, drugi wokalista (w: "Discipline", "Thela Hun Ginjeet", "Matte Kudasai", "Three of a Perfect Pair", "Frame by Frame", "Sleepless", Heartbeat”, "Elephant Talk") Michael Giles – perkusja, drugi wokalista (w: "21st Century Schizoid Man", "I Talk to the Wind", "Epitaph", "Cat Food", "The Court of the Crimson King") Greg Lake – główny wokalista, gitara basowa (w: "21st Century Schizoid Man", "I Talk to the Wind", "Epitaph", "Cat Food", "The Court of the Crimson King") Ian McDonald – instrumenty dęte, stroik, instrumenty klawiszowe, melotron, drugi wokalista (w: "21st Century