A composition by this man, once synonymous with the two-step, was commissioned for an essay contest by a newspaper.
This man predicted a grim future where music comes from "talking and playing machines" in his essay "The Menace of Mechanical Music". One of this man's compositions was used by circus bands to signal "disaster" and begin crowd evacuation. Charles Klein wrote a libretto for an operetta by this man in which Don Enrico Medigua kills, and then disguises himself as, the title Peruvian. A composition by this man, once synonymous with the two-step, was commissioned for an essay contest by a newspaper. This conductor of "The (*)  President's Own" band added a removable bell to the helicon, a type of bass tuba often named for him. For 10 points, name this composer of  El Capitan , "The Washington Post", "Semper Fidelis", and "The Stars and Stripes Forever", the American "March King".
This man predicted a grim future where music comes from "talking and playing machines" in his essay "The Menace of Mechanical Music".
John Philip  Sousa  