What type of musical structure is primarily used in Arcadelt's "Il bianco e dolce cigno"?

Arcadelt's "Il bianco e dolce cigno" is primarily structured as through-composed, meaning that the music is continuous, non-repetitive, and evolves, reflecting the text throughout the piece. In this form, each new section of music corresponds to a new stanza or line of lyrics, allowing for a seamless flow that enhances the emotional and narrative depth of the song. This structure is particularly effective in art songs, where changes in the music can mirror the shifts in meaning or emotion in the poetry being set to music.

In contrast, the strophic form features repeated sections of music for each stanza of lyrics, while binary form typically consists of two contrasting sections, and a rondo involves recurring themes interspersed with different sections. Since "Il bianco e dolce cigno" does not adhere to these repetitive or fixed structural formats, the through-composed approach is the most appropriate and fitting description of its musical organization.