The source of our knowledge of the frottola music is nine volumes of these songs, averaging sixty-four to the volume, published by Petrucci at Venice between 1504 and 1509, and a book of twenty-two published at Rome by Junta in 1526. Ambros's study of these works convinced him that the composers "while not having actually sat in the school of the Netherlanders, had occasionally listened at the door." The composers of the frottole showed sound knowledge of the ancient rules of ligature and the correct use of accidentals; on the other hand it is always held by the writers of the early periods that an elaborately made frottola is no longer a frottola, but a madrigal. Thus Cerone[25] in the twelfth book of his "Melopeo" gives an account of the manner of composing frottole. He demands for this species of song a simple and easily comprehended harmony, such as appears only in common melodies. So we see that a frottola is practically a folk song artistically treated.
"He who puts into a frottola fugues, imitations, etc., is like one who sets a worthless stone in gold. A frottola thus ennobled would become a madrigal, while a madrigal, all too scantily treated, would sink to a frottola." A typical frottola by Scotus shows observance of Cerone's requirements.
[MIDI file] with varia (optional sharps)
[MIDI file]without varia
Both files changed the final low F in the bass line to G.
These compositions are what we would call part songs and they are usually constructed in simple four-part harmony, without fugato passages or imitations. When imitations do appear, they are secondary and do not deal with the fundamental melodic ideas of the song. Nothing corresponding to subject and answer is found in these works. If we turn from a frottola to a motet by the same composer, we meet at once the device of canonic imitation and with it a clearly different artistic purpose. These composers evidently did not expect the people to be such accomplished musicians as the singers of the trained choirs.