 O'Brien conducted with soloists Bene McAteer, Brendan Cavanagh and Gerald Duffy.Haydn's Heiligmesse and Missa in Tempore Belli followed, but a December 1972 performance in St. James's Church of Antonín Dvořák's Requiem Mass was a turning point in the choir's career.It led to RTÉ inviting the group to undertake Haydn's "The Creation" with the RTÉ Concert Orchestra under Colman Pearce.