Rokathia black box
From Tardis Wiki, the free Doctor Who reference
A Rokathia black box was a device used onboard Rokathia spaceships. They were difficult to break, and transmitted signals using music. They were programmed with intelligence and telepathy, allowing them to tap into people's minds and manipulate them into doing their will. One crashed near the city of Vanezia and was found by Magrillo. It instructed him to build an opera house and an automatic orchestra so that it could beam an SOS signal into space by absorbing the music in people's minds. It was eventually destroyed by Frederico Gobbo. (DWS: Opera of Doom)
