On the Frankfurt stock exchange, its ticker symbol is LOUD. Deutsche Entertainment AG (DEAG), a company specialising in organising rock and pop concerts as well as other events across Germany, Switzerland and Britain, announced this Wednesday that it was forming a joint venture with three former Aiken Promotions staff to begin operations in Ireland. Fin O’Leary, Brian Hand and Simon Merriman were concert promoters with Peter and Mary Aiken’s firm until April. They are now DEAG’s partners in Singular Artists, which the German group said in a market announcement “will organise concerts and events in Ireland and Northern Ireland and…