At is the maximum number of independent voices that can sing sumer is icumen in?

The maximum number of independent voices that can sing "Sumer is icumen in" is six. This medieval English round, also known as a rota, features a complex polyphonic structure where each voice enters at different times, creating a rich tapestry of sound. The voices typically include a cantus (melody), tenor, and several other parts that harmonize with the main theme.