In 1996, Gareth formed Sinfonia Cymru which, in recent years, has established itself as Wales’ premier chamber orchestra. Many prominent artists have worked with Gareth and the orchestra including Dennis O’Neill, Rebecca Evans, Simon Keenlyside, Joseph Calleja, Gwyn Hughes Jones, Jean Phillipe Collard, Peter Donohoe, David Pyatt, Michael Collins, Chloe Hanslip, Catrin Finch, Guy Johnston, Liwei Qin, Alina Ibragimova, Jiafeng Chen and Llyr Williams.
As a result of a highly acclaimed Gala concert given by Sinfonia Cymru in April 2000 with Bryn Terfel, which included a performance of “Wotan’s Farewell”, a special bond has developed between Bryn, Gareth and the orchestra. Gareth has worked with Bryn Terfel on numerous projects including the recording “We’ll Keep a Welcome”, opera galas at the Faenol, Henley and Hampton Court Festivals and an S4C recording of Handel’s “Messiah”. In addition Gareth has conducted more than sixty concerts worldwide with Bryn, including his BBC Proms debut with Renee Fleming and Bryn in works by Wagner and Strauss. Gareth has been the regular conductor at the Faenol Festival where he has worked with international singers such as Andrea Bocelli, Angela Gheorghiu, Rolando Villazon, Renee Fleming, Carlos Alvarez and Diana Damrau.
Concert work in the United Kingdom has included appearances with the Hallé Orchestra, the Scottish Chamber Orchestra, the Orchestra of Welsh National Opera, Royal Scottish National Opera, BBC National Orchestra of Wales, Royal Liverpool Philharmonic Orchestra, Royal Philharmonic Orchestra, the Philharmonia Orchestra, the Ulster Orchestra, English Chamber Orchestra and the Manchester Camerata.
Future engagements in 2013-14 include Madama Butterfly for Welsh National Opera, the UK premiere of Philip Glass’s A Perfect American for English National Opera and a Scandinavian tour with Bryn Terfel of an all-Wagner programme.