Roland made a piano with flying drone speakers
by: Online Piano Atlas - Four drone speakers in a matching wood finish are made to work with the 50th Anniversary Concept Piano and are meant to float in the air above and around the instrument. Due to the drones' ability to "operate on a low latency dedicated communication channel," they can produce sounds that are perfectly in time with those coming from the piano's speakers, and the pianist can direct their movement as needed.
Drone technology appears to be based on the