From the scholia to Aristophanes, Acharnians 13-14, where the following phrase (garbled by the present lemma) occurs: "I was pleased when, after Moschos, Dexitheos came in singing in the Boiotian mode".
[1] For the kithara see kappa 1590 (and cf. kappa 1591).
[2] tau 354.
[3] The word for 'Phrygian' here is in the masculine singular, implying that a Phrygian man also invented the Boeotian mode just like Terpander. This is probably a mistake, however; the scholia have the neuter form of the adjective (τὸ Φρύγιον ), making the reference not to a Phrygian person but the Phrygian mode, also said to be invented by Terpander.