By Denise Winterman,BBC News Magazine
A 90-second daily show highlighting the songs of British birds has started on BBC Radio 4 this week. But birdsong isn't just beautiful to listen to, it is increasingly being used in surprising ways.
Can a nightingale's song help you pass an exam or a blackbird's twittering encourage you to open a bank account? Sound experts are using it to do both.
They argue the positive results speak for themselves even though researchers say there is little hard scientific evidence to show people respond positively to birds singing. Most support for the theory is anecdotal.
So what are the innovative ways it is being used?