The crossword solution for the term 'Solos for Sills' is 'ARIAS'. An aria is a self-contained piece for one voice, with or without instrumental accompaniment, normally part of a larger work such as an opera, cantata, oratorio, or musical. The term is also used to refer to the style of singing developed in Italian opera of the Baroque era. Barbara Sills was an American operatic soprano who had a long and successful career with the New York City Opera. She was known for her performances of ARIAS from the operas of Mozart, Handel, and other composers.