Casals, Pablo. (1876–1973) Rare CELLO Content Letter, matted with PhotographTLS on correspondence card, 5"x31 2", n. p., Apr 14, 1956. From the great Spanish composer, conductor, and cellist, one of the most influential musicians of the 20th century, also well known as a humanitarian. To Mr. Renard regarding his use of steel strings. In part: "Your letter has caused me quite a surprise. I want to tell you though, that I have never played on steel strings and would never even dream of doing so. I understand so well your being