"The British Library has launched a new CD that puts birdsong under the acoustic microscope, revealing the hidden detail of some of the natural world's most impressive songs. Many songbirds, such as the Skylark, Icterine Warbler and Grey Fantail produce songs that astound us with their complexity and speed of delivery. Though these songs never fail to impress, it is almost impossible for the human ear to distinguish the wealth of hidden notes and surprising melodies that make up these remarkable compositions. Secret Songs of Birds: The Hidden Beauty of Birdsong Revealed features 24 original recordings played alongside digitally mastered versions where the natural speed has been slowed down to reveal the subtle intricacy of each song in its full splendour. These extraordinary avian sound recordings are combined with an expert account of the latest theories about birdsong and its meaning"