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Simple harmony can be created when a melody is accompanied by a long, sustained tone called a drone.
A drone is a type of unmanned aerial vehicle (UAV), which is an aircraft without a human pilot, crew, or passengers. Unmanned aerial vehicles (UAVs) are a part of unmanned aircraft systems (UAS), which also feature the addition of a controller on the ground and a communications network with the UAV. The flight of UAVs can be controlled remotely by a human pilot, or it can have varying degrees of autonomy, such as autopilot help, up to fully autonomous aircraft that don't allow for human intervention.
drones were originally developed through the twentieth century for military missions too "dull, dirty or dangerous" for humans, and by the twenty-first, they had become essential assets to most militaries. As control technologies improved and costs fell, their use expanded to many non-military applications. These include forest fire monitoring, aerial photography, product deliveries, agriculture, policing and surveillance, infrastructure inspections, science, smuggling, and drone racing.
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