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
Panegyrics as well as comic songs appear to have been uniformly sung in Saturnian metre, of course to the pipe, and presumably in such a way that the -caesura- in particular in each line was strongly marked; and in alternate singing the second singer probably took up the verse at this point.
The Saturnian measure is, like every other occurring in Roman and Greek antiquity, based on quantity; but of all the antique metres perhaps it is the least thoroughly elaborated, for besides many other liberties it allows itself the greatest license in omitting the short syllables, and it is at the same time the most imperfect in construction, for these iambic and trochaic half-lines opposed to each other were but little fitted to develop a rhythmical structure adequate for the purposes of the higher poetry.
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Reference address : https://www.ellopos.net/elpenor/rome/1-15-art.asp?pg=12