Revered Spanish cellist and composer (1876–1973) widely regarded as the greatest player in the history of the instrument. ALS, in French, two pages, 5.25 x 8.5, November 2 [no date; early 20th century]. Casals writes from Paris to an unnamed female friend, mentioning a previous concert in Holland and an upcoming engagement in Germany. Intersecting mailing folds (vertical fold to first name), otherwise fine condition. R&R COA.