On 23 November the Gran Salon at the National Museum of Archaeology is due to host a unique and remarkable performance by one of the world's best theremin players, Carolina Eyck.  The theremin is a most unusual musical instrument since it is controlled or played without physically coming into contact with any part of it. It works electronically and can produce sound when the performer moves his or her hands through the invisible electromagnetic fields that the instrument produces. The sounds which emanate from the theremin are unique, often compared to squealing or wailing, and create an eerie atmosphere.