Note 986 — Chapter XIII · THE FEAST OF FOOLS
Reading edition
A prosa is a term given in French liturgies to an additional chant inserted on festal occasions as a gloss upon or interpolation in the text of the office or mass. It covers nearly, though not quite, the same ground as Sequentia, and comes under the general head of Tropus (ch. xviii). For a more exact differentiation cf. Frere, Winchester Troper, ix. Laetemur gaudiis is a prose ascribed to Notker Balbulus of St. Gall.