Dream of Birds – documentary

What happens when a forest loses its birdsong? Following clues hidden in the sounds birds make while asleep, Argentinian physicist Gabriel Mindlin uncovers a hidden extinction – not of species, but of memory – and sets out to revive vanished melodies before they disappear forever.

Stephen Shears obituary

Other lives: Piano tuner and restorer who also played keyboards on the West Country folk dancing circuit

George Fenton obituary

Versatile composer of music in a variety of styles for stage, TV and film whose theme for Newsnight was first heard in 1980