Final answer:
Composers began to be recognized in the Renaissance era, which started around 1400 and ended around 1600. The emergence of a common musical language and the polyphonic style of the Franco-Flemish school marked this recognition.
Step-by-step explanation:
The composers began to be recognized in the Renaissance era. Renaissance music is music written in Europe during the Renaissance, which started around 1400 and ended around 1600. During this time, there were significant developments in music influenced by the rise of humanistic thought, the Protestant Reformation, and the growth of commercial enterprise, among others. The emergence of a common musical language, particularly the polyphonic style of the Franco-Flemish school, marked the recognition of composers in the Renaissance era.