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
The fundamental elements of the national music and choral dancing in Latium, which must likewise have been established during this period, are buried for us in oblivion; except that the Latin pipe is reported to have been a short and slender instrument, provided with only four holes, and originally, as the name shows, made out of the light thighbone of some animal.
Lastly, the masks used in after times for the standing characters of the Latin popular comedy or the Atellana, as it was called: Maccus the harlequin, Bucco the glutton, Pappus the good papa, and the wise Dossennus--masks which have been cleverly and strikingly compared to the two servants, the -pantalon- and the -dottore-, in the Italian comedy of Pulcinello--already belonged to the earliest Latin popular art.
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Reference address : https://www.ellopos.net/elpenor/rome/1-15-art.asp?pg=13