"Although the Paris conurbation has a very high population density there are still many areas of special natural habitats within the capitals boundaries and on its outskirts, full of unique natural mixes of sounds. Their distinct sounds are due to the different bird species that make up the music of these natural concerts. The natural sound recorders, François Charron and Pierre Huguet, have put together four real concerts of the natural world, followed by an identification guide to the principal, commoner species." Patrick Frémeaux