Sad songs say so much

In 1649, a month after the execution of King Charles I, the distraught composer Thomas Tomkins wrote a piece of music called "A sad pavan for these distracted times". And in our own confusing times, is sad music what we need - or not? Tom Service looks at music's power to heal, to build community and to redefine historical events. With Associate Professor at University College London, Dr Daisy Fancourt, and author of "Singing in the Age of Anxiety", Laura Tunbridge.