Letters to Felix Borowski from publishers, composers, conductors, musicians, newspaper editors, and others. Notable composer correspondents include Mili Balakirev, John Alden Carpenter, Vincent d'Indy, Percy Grainger, Edvard Grieg, Paul Hindemith, Darius Milhaud, John Philip Sousa, and Ralph Vaughan Williams. Many letters from the late 1940's from publishers concern permissions to quote from musical works for Borowski's unpublished book Encyclopedia of the Symphony. Telegrams and letters from 1952 tend to be birthday wishes for Borowski's 80th birthday. Two years previous, there was a testimonial dinner held in honor of Borowski on Jun. 1, 1950, and many letters and tributes came to Borowski; those materials are collected together in one folder near the end of the series.