In December 2013, Nicholas made his début with the ACO in three concerts of Bach’s Christmas Oratorio, in Canberra, Sydney Opera House and Melbourne Arts Centre. Of the concerts, Harriet Cunningham, in the Sydney Morning Herald, wrote, “Mulroy’s biography states that he is “the most sought-after evangelist of his generation”. It’s a big call, but to hear him sing there is no doubt. He is a cogent story-teller, with a radiant sound that just gets more ravishing as it gets higher. It is hard to imagine anyone singing it better.” Clive O’Connell in The Age, spoke of “Nicholas Mulroy’s flawless Evangelist” and Jennifer Gall in the Canberra Times, said “…Nicholas Mulroy established the standard for the entire performance with his opening recitative. His vocal strength, coupled with a sustained, dramatic presence, kept the audience engaged with the story…”.