Track 5, "A Well Tuned Lyre - The Just Intonation of Antiquity".
This haunting, almost dream-like fragment of melody was preserved in ancient Byzantine manuscripts (Conspectus codicum:V. Venetus Marcianus appl. cl. VI, saec. XIII-XIV N. Neapolitanus graecus III. C4, saec. XVF. Florentius Ricc. 41, saec. XVI), in the unambiguous alphabetical musical notation used in ancient Greece.
This haunting melodic fragment is simply catalogued as "Anonymous, Bellermann 97":