Rhythm was often not notated. We assume that it was tied to text in vocal music and to dance in instrumental music. Melodies are often long and flowing. Texted music is often melismatic.
Form comes from text in vocal music.
The structure of instrumental music is based on repeating sections. Polyphonic Style Voices and instruments were often mixed. Nonimitative counterpoint, with voices moving at different rhythmic speeds, is the primary texture. Rhythms are often restless and active. Melodies are long and asymmetrical.