‘The word Lullaby is used in the sense of an incantation to sleep’ explains Oliver Knussen in a programme note for his exquisite 6-minute piano piece Sonya’s Lullaby. ‘Sonya is my daughter, who was a four-month-old insomniac in October 1977 when the first sketch of this piece was written. Formally the music is, I hope, self-explanatory – but perhaps it is worth mentioning that an initials stimulus toward the piano writing was the harmonic exploitati...