ONE of Ireland’s greatest female singers is coming to St David’s Hall as Mary Coughlan brings her remarkable voice to the Roots Unearthed series next Tuesday (15 March). Over the last 25 years, Mary has established herself as a superb solo artist with her enviable body of work encompassing the genres of jazz and folk in an uncompromising, wholly personal and universal manner. Whether she’s tackling Cole Porter, Jerome Kern, Elvis Presley or even Joy Division, her flawless delivery sails…