A unique organ roll of J. S. Bach's Passacaglia in c minor for organ, arranged and recorded by Leopold Stokowski for the Duo-Art Aeolian Pipe Organ, 1925, and presented as a Christmas gift for Edward and Mary Louise Curtis Bok

Note: "Prince" was the Bok's nickname for Stokowski (ascribed after the pianist Josef Hofmann referred to Stokowski as a "prince of conductors")

Letter of resignation from Leopold Stokowski to Curtis Bok, 29 July 1941

Edward Bok's son, Curtis, would follow his father as an active supporter of Stokowski and the Philadelphia Orchestra, serving as President of the Orchestra board at the opening of the 1934-35 concert season. In December 1934, however, Bok resigned his position in a show of support for the conductor, whose artistic and managerial demands were at the center of a power struggle among board members.

This letter was written at the conclusion of Stokowski's final season with the Orchestra, which he would not conduct again until 1960.