The term 'Songs That Can Be Trilling' can be answered with the crossword solution 'ARIAS' (5 letters). 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. ARIAS are usually written in a highly structured form and often include sections of recitative, arioso, and cabaletta. They are typically very melodic and often include trills, which are rapid alternations between two notes.