The crossword solution for the term 'Sills Songs' is 'ARIAS'. An aria is a self-contained piece for one voice usually with orchestral accompaniment, from an opera, cantata, oratorio, or other large vocal work. It is a type of song that was popularized during the Baroque period and is still used in modern operas. The term 'Sills Songs' refers to the works of American soprano Beverly Sills, who was known for her performances of ARIAS.