London's most famous sound is broadcast to the world daily from a microphone high in the tower. This is how it sounds from street level.
Emerging from the underground station into the street.
A city back alley, the 'chinks' are ropes blowing against a flagpole.
Blackbirds are London's commonest songbirds. So much so that on occasions it is virtually the only species singing. The sound reverberates up and down the street, which gives a particularly urban feel.
Heart of London's Bangladeshi community.
Open 24 hours a day this is one of London's favourite night stops.
The River Thames is surprisingly quiet and one has to search for its sounds. The two here are slurps under the overhang of the wharf and squeaky barges rising and falling on the swell.
Along London's canal towpaths are areas of loose concrete slabs which rock musically when cycled over.
the voice of Tom Brake
Sounds of the market packing up around 4.30pm on a Saturday
Charles Hayward explains.
Underground journey on the Bakerloo Line
A sound fast disappearing from London's soundscape. Recorded 1987
Among the species heard are Song Thrush, Blackbird, Robin and Wood Pidgeons.
With honking Canada Geese
People murmering and cafe clinks heard in the fabulous acoustic of the museums's new court. Classic stone, classic reverberation.
The Muslim call to prayer is a recent addition to London's soundscape. Situated in Whitechapel the East London mosque is very close to the city heliport.
A unique outer London sound combination, Europe’s most spectacular bird song against the all pervasive high voltage substation hum.
Through the turnstiles.
Two human toddlers imitate a very young coot chick screeching to be fed.
Vehicles bumping over the expansion joints in the flyover, as heard from below.
Part of the underground’s electricity supply, the hum varies in tone with the changing current drawn by passing trains.
Swifts, screaming around the rooftops, are a definitive summer sound and mark out spaces upwards and outward in a way that few others do. The knowledge that these birds migrate thousands of miles to the warmth of Africa makes it, for me, a sound that connects London to the world outside.
London from near the top of a tower block on a damp March evening, Holloway Road