The term CELLIST refers to a MUSICIAN who plays the cello, a string instrument. The crossword solutions CASALS (6 letters), JANOS (5 letters), PABLO (5 letters), MUSICIAN (8 letters), and ARCO (4 letters) all relate to this profession. CASALS was a Spanish cellist and composer who is considered one of the greatest cellists of all time. Janos Starker was a Hungarian-American cellist who was known for his technical mastery of the instrument. Pablo CASALS was a Catalan cellist, composer, and conductor who was awarded the Presidential Medal of Freedom in 1963. MUSICIAN is a broad term that can refer to any person who plays an instrument, including the cello. ARCO is a musical term that refers to the technique of playing a stringed instrument with a bow.