The crossword solution for the term 'SOLO FOR SCOTTO' is ARIA, which is an Italian word meaning 'AIR' or 'MELODY'. It is often used to refer to a self-contained piece of music, usually for a single voice with accompaniment. In opera, an ARIA is a song for a solo singer, often with a dramatic or emotional character. The term 'SOLO FOR SCOTTO' could refer to a specific ARIA written for a particular singer, such as Scotto.