Lorca's theory - which many researchers today would agree with - was that a large part of the function of the lullaby is to help a mother vocalise her worries and concerns.
To address this, the Gates Foundation has sponsored a programme called Women Accessing Realigned Markets (Warm), which uses community theatre to overcome the challenge of illiteracy and vocalise the issues they face.
Mr Higson told court he could see in Sara Ege's eyes that she knew her son was dead, but "she didn't want to vocalise it, and accept that her child was dead".