Watch on Soap2day. Founded in 2012 by Laurence Equilbey, the Insula Orchestra performs on period instruments and experiments with new concert formats. In summer 2018, the French conductor and her ensemble will present a little-known work by Mozart at the Parisian cultural center La Seine Musicale: the incidental music to "Thamos, King in Egypt". In 1773, the author Tobias Philipp Freiherr von Gebler asked his fellow Freemason Wolfgang Amadeus Mozart to compose incidental music for his heroic drama "Thamos, King of Egypt". The boy wonder composed two choruses and five interludes for the play, which took up the Egyptian theme popular in the 18th century.