The term 'PART PIANO' can be solved by the crossword solution 'PEDAL', which is a five-letter word. A piano PEDAL is a foot-operated lever on a piano that is used to sustain notes or change the timbre of the sound. There are three pedals on a modern grand piano, and two on an upright piano. The right PEDAL is the sustain PEDAL, which allows the player to hold down multiple notes at once. The left PEDAL is the soft PEDAL, which reduces the volume of the notes. The middle PEDAL is the sostenuto PEDAL, which sustains only the notes that were played before the PEDAL was pressed.