So, in today's terms is Daniel O' Donnell (who often sings Irish ballads), an Irish Tenor, when performing a certain type of material? I am only referring to the vocal classification.

I used to think it was a more macho type of trained voice, but then I think I may be mixing up baritones. It's operatic baritones who used the marketing of 'three tenors', 'three Irish tenors', 'Scottish tenors'. I suppose it's not very convenient to put on the cover 'the three baritones'.

I've got it the wrong way round if the lighte more effeminate type of voice of the likes of Stephen Gately (see Wiki) is actually what defines an Irish tenor!