Greater London is often referred to as "the City" or "the Square Mile" and it forms the main financial district. Archaically, the urbanised area of London was known as the Metropolis. In common usage, the terms "London" and "Greater London" are usually used interchangeably. Greater London is officially divided for some purposes, with varying definitions, into Inner London and Outer London. For some strategic planning purposes it is divided into five sub-regions. Greater London is under the strategic local governance of the Greater London Authority (GLA). It consists of an elected assembly, the London Assembly, and an executive head, the Mayor of
City of London Sinfonia City of London Sinfonia City of London Sinfonia (CLS) is an English chamber orchestra based in London. CLS performs regularly across the city of London in venues from East London clubs to traditional Central London concert halls. CLS is Orchestra-in-Residence at the critically acclaimed Opera Holland Park (since 2004) and holds a residency at St Paul's Cathedral. The Orchestra has developed close links with joint venture partners in Mexico and Japan, having toured to Mexico in May 2015 and to Japan in March 2017. It is a registered charity under English law. CLS performs chamber orchestra and ensemble repertoire from