How did the French chanson become an important early polyphonic song form?

The French chanson evolved into a significant polyphonic form through a gradual transition from monophonic roots and accompanied solo songs to complex vocal ensembles. Initially, the chanson relied on the formes fixes—the ballade, rondeau, and virelai—which were typically set for a solo voice with instrumental accompaniment.12

The Burgundian school played a pivotal role in this development during the 15th century, emphasizing a vocal top part supported by lower instrumental lines. By the mid-15th century, polytextual chansons emerged, featuring multiple singers performing different texts simultaneously.21

The transition to a true polyphonic vocal ensemble was solidified by composers like Josquin des Prez, who moved toward a four-voice texture where all parts sang the same text, utilizing both melodic imitation and homophonic styles. This evolution continued into the 16th century, reaching a peak of polyphonic perfection in the works of Orlando di Lasso, where melodic imitation became the primary structural foundation.1