The term 'VIOLIN's Big Brother' refers to two instruments, the CELLO and the bullfiddle. The CELLO is a stringed instrument of the VIOLIN family, with four strings tuned in perfect fifths. It is played by sitting and supporting the instrument between the knees while using a bow to produce sound. The bullfiddle is a larger version of the CELLO, also known as the double bass or contrabass. It has a deeper, richer sound than the CELLO and is usually played with a bow or plucked with the fingers.