For anyone interested in birdsong who hasn’t already spotted this, the BBC is running a 90-second daily show highlighting the songs of British birds. Some general information about birdsong is available from http://www.bbc.co.uk/news/magazine-22298779.
If you aren’t generally up at 05:58 BST to hear the show on Radio 4, it can be heard and downloaded from:
http://www.bbc.co.uk/podcasts/series/totd