The term 'Things to Whistle' can refer to a variety of different items, including songs, melodies, and even sound effects. The crossword solution for this term is 'TUNES, ' which is an appropriate answer as tunes are often used when whistling. Tunes are musical compositions that are typically composed of a melody, harmony, and rhythm. They can be used to create a wide range of sounds, from simple whistles to complex musical pieces.