For much of its life the theme music of Brain of Britain was the opening of the fourth movement of Mozart's Eine Kleine Nachtmusik, but in a 'modernised' version by Waldo de Los Rios. This choice was the subject of frequent complaints from classical music fans (with whom the show was popular) and presenter Robert Robinson described it on air as "Mozart plus sacrilege". The theme was changed to a more conventional version in the early nineties.