I went to:
http://www.rte.ie/rnag/neadnafuiseoige.html Which is the link to the "Nead Na Fuiseoige" page and then I clicked on the Monday program...I really don't know much more than that. However, I just finished listening to the Tuesday program and I heard the same people speaking...so I am assuming that they are the regular presenters.
From the sounds of the program, the man is the lead presenter who transitions the music...it is a music program...and then the women speak in between the music. So it could very well be that they are giving news updates and information...
Although it was very quick...I do believe I heard the name "Gráinne," but I could not follow as to if they were just talking about her, or if it was an introduction...