{"value"=>"Includes letters from Vincent Persichetti (under the auspices of Elkan-Vogel Co.), Halim El-Dahb, Herbert Elwell, Jon E. Engberg, Alvin Epstein, Paul Epstein, Donald Erb, Robert Erickson, Pozzi Escot, Alvin Etler, Paul Earls, Mariano Etkin, and others."}