Related Information for Celtic Tenors The Celtic Tenors began life as the Three Irish Tenors on RTE's Theatre Nights on October 1995. The group at that time consisted of James Nelson, Niall Morris and Paul Hennessey.In 2000, Matthew "Gilly" Gilsenan replaced Paul Henessey and the Celtic Tenors were then formed and signed to EMI. Singing a mixture of Celtic, Operatic and re-worked popular songs, the group have travelled extensively with many tours concentrated in the USA, Canada, Germany and the Netherlan.. read more