Blackburn has always collected things that hold stories about the past, especially the very distant past: mammoth bones, two-million-year-old shells, a flint shaped as a weapon long ago. Time Song brings many such stories together as it tells of the creation, the existence and the loss of a country now called Doggerland, a huge and fertile area that once connected the entire east coast of England with mainland Europe, until it was finally submerged by rising sea levels around 5,000 BC.