1903 Envelope Addressed to Adeline P. Blakely (Parent-in-Law of Edward S. Morse)

 Her maiden name was Adeline Pritchard Low, wife of David Blakely (music manager of John Philip Sousa). Their daughter Julia married John Gavit Morse (son of Edward S. Morse) in 1899. This 1903 postmarked piece from Salem is inscribed "From dear Professor Morse."

Adeline P. Blakely

David Blakely served as the manager and agent for John Philip Sousa during a critical period of his career, which included Sousa's time as the leader of the United States Marine Band and later as the conductor of his own civilian band, the Sousa Band. Blakely played a key role in promoting Sousa's music and helping him achieve widespread recognition and success. He was involved in booking performances, handling contracts, and ensuring that Sousa's compositions and performances reached a broad audience.

Blakely's collaboration with John Philip Sousa contributed to the popularization of American music, particularly patriotic and military-themed compositions. Sousa's marches, such as "The Stars and Stripes Forever," became iconic pieces, and Blakely's efforts in marketing and management helped in this regard.

Through his work with Sousa, David Blakely played a part in shaping the landscape of American music during the late 19th and early 20th centuries. Sousa's music and performances, often associated with national pride and patriotism, left a lasting impact on American culture. While David Blakely may not be as widely recognized as John Philip Sousa, his role as a manager and promoter was instrumental in advancing Sousa's career and the popularity of American music.