The term 'Step on a Scale' can be broken down into two crossword solutions: TONE (4 letters) and SOL (3 letters). TONE is a noun that refers to any sound, whether vocal or musical, that is produced by the human voice or an instrument. It can also refer to a particular quality of sound, such as a deep or high pitch. SOL is a musical term that stands for the fifth note of the diatonic scale in solfège, which is a system of music notation.