The term 'Piano Tune' can be summarized by the crossword solution 'RAG', which is a three-letter word. Ragtime is a genre of music that originated in the United States in the late 19th century. It is characterized by syncopated rhythms and a steady bass line, and often features the piano as its main instrument. Piano tunes are a type of ragtime music, and they are usually composed of short, repetitive melodies.