The term 'Guitar RANGE' can be broken down into two words, 'Guitar' and 'RANGE'. The word 'Guitar' refers to a stringed musical instrument that is typically played with the fingers or a pick. The word 'RANGE' refers to the RANGE of notes that can be played on the instrument. In this case, the crossword solution for 'Guitar RANGE' is 'ALTO', which is a type of guitar that has a higher RANGE of notes than other guitars. ALTO guitars are often used in jazz and classical music.