Composer Anna Clyne on her new album 'Shorthand'

A new album mapping 10 years of string writing, Anna Clyne's Shorthand takes its name from a concerto for cello and strings, performed on the album by Yo Yo Ma. Hattie Butterworth meets Anna to speak about this new project, as well as her BBC Proms commission and the impact of words, poetry and spirituality on her writing.