The 2013 Kenneth Tickell organ in St Mary's RC Cathedral, Newcastle 'In the British organ world of the 1960s a whole new jangle of minimalistic 4ths, 5ths and 7ths, painted in a rash of nazards, nones and assorted neo-baroquery, and sporting fidgety ostinato rhythms, cavorted rudely into that hallowed world of comforting chromatics, harmonious 6ths and 3rds, and pastoral preludes', says James Parsons. James is inviting organists to share exploration and performance of this music in Newcastle on Saturday 19th October, in an RCO class on the 2013 three-manual Kenneth Tickell organ of St Mary's RC…