Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Dance, Music, and Song among the Sabellians and Etruscans
Regarding the development of the fine arts among the Etruscans and Sabellians our knowledge is little better than none.(16)
16. We shall show in due time that the Atellanae and Fescenninae belonged not to Campanian and Etruscan, but to Latin art.
We can only notice the fact that in Etruria the dancers (-histri-, -histriones-) and the pipe-players (-subulones-) early made a trade of their art, probably earlier even than in Rome, and exhibited themselves in public not only at home, but also in Rome for small remuneration and less honour. It is a circumstance more remarkable that at the Etruscan national festival, in the exhibition of which the whole twelve cities were represented by a federal priest, games were given like those of the Roman city-festival; we are, however, no longer in a position to answer the question which it suggests, how far the Etruscans were more successful than the Latins in attaining a national form of fine art beyond that of the individual communities.
On the other hand a foundation probably was laid in Etruria, even in early times, for that insipid accumulation of learned lumber, particularly of a theological and astrological nature, by virtue of which afterwards, when amidst the general decay antiquarian dilettantism began to flourish, the Tuscans divided with the Jews, Chaldeans, and Egyptians the honour of being admired as primitive sources of divine wisdom.
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Reference address : https://www.ellopos.net/elpenor/rome/1-15-art.asp?pg=28