The term 'OLD FIDDLE' is composed of three crossword solutions: VIOL (4 letters), REBEC (5 letters), and REBECK (6 letters). The term refers to three stringed instruments that have been used for centuries. The VIOL is a bowed string instrument that was popular in the Renaissance period. The rebec is a small, bowed string instrument that was popular in the Middle Ages. The rebbeck is a medieval fiddle with a short neck and two strings. All three instruments are still used today in folk music and traditional music.