What musical form is Estudio Sin Luz by Andres Segovia in?

"Estudio Sin Luz" by Andrés Segovia is primarily composed in a free-form structure, displaying characteristics of an étude that focuses on technical proficiency and expressive playing. While it incorporates elements of classical guitar techniques, it does not adhere strictly to traditional musical forms like sonata or rondo. Instead, it emphasizes lyrical melodies and intricate fingerwork, showcasing Segovia's virtuosity and emotional depth.