In regard to this latter point, there is reason to believe that the expansion of Greek music was the immediate determining cause; for it has been already stated that the musical scale and instruments of the Greeks, originally very narrow, were materially enlarged by borrowing from Phrygia and Lydia, and these acquisitions seem to have been first realized about the beginning of the seventh century B. C., through the Lesbian harper Terpander,—the Phrygian (or Greco-Phrygian) flute-player Olympus,—and the Arkadian or Bœotian flute-player Klonas. Terpander made the important advance of exchanging the original four-stringed harp for one of seven strings, embracing the compass of one octave or two Greek tetrachords, and Olympus as well as Klonas taught many new nomes, or tunes, on the flute, to which the Greeks had before been strangers,—probably also the use of a flute of more varied musical compass. Terpander is said to have gained the prize at the first recorded celebration of the Lacedæmonian festival of the Karneia, in 676 B. C.: this is one of the best-ascertained points among the obscure chronology of the seventh century; and there seem grounds for assigning Olympus and Klonas to nearly the same period, a little before Archilochus and Kallinus.[145] To Terpander, Olympus, and Klonas, are ascribed the formation of the earliest musical nomes known to the inquiring Greeks of later times: to the first, nomes on the harp; to the two latter, on the flute,—every nome being the general scheme, or basis, of which the airs actually performed constituted so many variations, within certain defined limits.[146] Terpander employed his enlarged instrumental power as a new accompaniment to the Homeric poems, as well as to certain epic proœmia or hymns to the gods of his own composition. But he does not seem to have departed from the hexameter verse and the daktylic rhythm, to which the new accompaniment was probably not quite suitable; and the idea may thus have been suggested of combining the words also according to new rhythmical and metrical laws.