The Christchurch Symphony Orchestra promise not one, but three concertos come Saturday 9 March, when 2023 Michael Hill Fellowship member violinists and 2022 Whakatipu Music Festival Young Artists Peter Gjelsten and Hazuki Katsukawa and Clarinettist and 2021 Whakatipu Festival artist Ben van Leuven compete in the finals of the 56th National Concerto Competition. The competition, which is in its 56th year, is one of New Zealand’s most prestigious and oldest music competitions for musicians 25 years and under.…