What characteristic does a de capo aria typically feature during the return to the "A" structure?

A de capo aria typically features ornamentation during the return to the "A" structure, which is a defining aspect of this musical form. In a de capo aria, after the initial presentation of the "A" section, the "B" section introduces contrasting material, often both thematically and emotionally. When the "A" section returns, it is common for the performer to elaborate upon the original melody with improvisational flourishes or written additions, enhancing the expressiveness of the music.

Ornamentation serves to not only embellish the melodic line but also to showcase the virtuosity of the performer, providing an opportunity for personal interpretation. This practice became particularly prominent in the Baroque period, where singers added complex vocal runs and trills, enriching the texture and emotional depth of the aria. Thus, the emphasis on ornamentation during the repeat of the “A” section is a key characteristic that distinguishes de capo arias from other musical forms, highlighting the performer's skill and the expressive potential of the composition.