Whatever the troubadours and minnesingers may have done toward establishing a metrical melodic form of monophonic character was soon obliterated by the swift popularity of part singing and the immense vogue of the secular songs of the polyphonic composers.

When the desire for the vocal solo made itself felt in the exquisitely sensuous life of medieval Italy, it found its only gratification in the easy art of adaptation.

In such scenes as those described by Boccaccio and much later by Castiglione there was no incentive to artistic reform, no impulse to creative activity.
We find ourselves, then, equipped with these significant facts: first, that the composition of secular music in polyphonic forms was at least as old as the thirteenth century; that part singing was practised in Italy as far back as the fourteenth century; that songs for one voice were made with Italian texts at least as early as the time of Dante and Boccaccio; that the art of arranging polyphonic compositions as vocal solos by giving the secondary parts to the accompanying instrument was known in the time of Minuccio and Casella; that at the time of Poliziano's "Orfeo" the frottola was the reigning form of part song, and that then and for years afterward it was customary to arrange frottole as solos by giving the polyphony to the lute or other accompanying instrument.
It seems, then, that we shall not be far astray if we conclude that the solo parts of Poliziano's lyric drama consisted of music of the better frottola type and that the moving appeals of his hero were accompanied on a "lyre" of the period in precisely the same manner as frottole transformed into vocal solos were accompanied on the lute.

For these reasons an example of the method of arranging a frottola for voice and lute will give us some idea of the character of the music sung by Baccio Ugolino in the "Orfeo." The examples here offered are those given in the great history of Ambros.

The first is a fragment of a frottola (composed by Tromboncino) in its original shape.