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
But, wherever
the dancers made their appearance, there appeared also the musicians
or--which was in the earliest times the same thing--the pipers.
They too were never wanting at a sacrifice, at a marriage, or at
a funeral; and by the side of the primitive public priesthood of
the "leapers" there was ranged, of equal antiquity although of far
inferior rank, the guild of the "pipers" (-collegium tibicinum-(2)),
whose true character as strolling musicians is evinced by their
ancient privilege--maintained even in spite of the strictness
of Roman police--of wandering through the streets at their annual
festival, wearing masks and full of sweet wine.
While dancing thus
presents itself as an honourable function and music as one subordinate
but still necessary, so that public corporations were instituted
for both of them, poetry appears more as a matter incidental and,
in some measure, indifferent, whether it may have come into existence
on its own account or to serve as an accompaniment to the movements
of the dancers.