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KMel Robotics has an airborne video recording service as one of the uses for its quadrotor drones, and apparently to showcase that function they programed some of their drones to play the music being recorded. They also had to create some special instruments the drones could play, mostly by modifying existing devices. In this video they play three tunes, Thus Spake Zarathustra (2001 theme), Carroll of the Bells, and the national anthem. They have to have recorded the sound the drone motors and fans make and be electronically subtracting it from the audio track in order to make the music clear, which makes me wonder if they chose the instruments because they were not on the same frequencies as those noises. Thanks to I Programmer for the heads up on this one.