London Life in Sound

The London Sound Survey, a growing collection of Creative Commons-licensed sound recordings of places, events and wildlife in the capital. Historical references too are gathered to find out how London's sounds have changed.
Go to www.soundsurvey.org.uk/ but make sure you set aside time to explore, it can draw you in. There's historical content, like comments of people watching the Battle of Britain, pub sing-alongs. ambient recordings of streets, the underground and at the British Library.
The blog has an item on the Cities and Memory project "mapping the real and imagined sounds of the world."