Which compositional device does sumer is icumen in exemplify?

"Sumer Is Icumen In" exemplifies the use of counterpoint, a compositional device where two or more independent melodies are played simultaneously. This piece features a round, or canon, where the main melody is repeated and overlapped by additional voices entering at staggered intervals. Additionally, it showcases textural variation, as the interplay between the voices creates a rich tapestry of sound, reflecting the vibrant themes of spring and renewal.