Katheen Gormley spent ten years as principal of St Cecilia's College, a Catholic girls' secondary school in Londonderry, and is now principal of Hazelwood Integrated College in Belfast.
The reason for choosing the 21st is that the 22nd is St Cecilia's day and StCecilia being the patron saint of music, there seemed a logic that we fast from music on the day before we may traditionally have celebrated and given thanks for music.