 Holden reportedly took time out from The High Kings last summer to co-write and produce a new album for a former X-Factor contestant, which will be released in 2019.The High Kings toured the US and Canada in Sept/Oct of 2018 mostly to sold-out crowds.Following another sold out UK tour in November and a high-profile televised award show in London, Danny O' Donaghue, lead vocalist with multi platinum group The Script spoke on UK radio, hailing Holden as one of his favourite Irish vocalists.