What is a defining feature of the three-part polyphony in 'Gaude Maria virgo'?

The defining feature of the three-part polyphony in 'Gaude Maria virgo' is that it alternates with monophonic chant. In this context, 'Gaude Maria virgo' consists of a multi-voiced texture, where the polyphonic sections are interspersed with sections that utilize monophonic chant. This creates a rich tapestry of sound that highlights the distinct characteristics of both the polyphonic writing, with its intricate interweaving of melodies, and the clarity of monophonic chant, which remains prominent in liturgical practice. This alternation not only serves to enhance the aesthetic and spiritual experience of the piece but also reflects the historical practices of early music, where polyphony gradually evolved alongside traditional chant.