found this at http://www.geocities.com/Athens/8308/encyclopedia.html
"Mac Giolla Ghunna, Cathal Buí was a priest who gave in to the sins of the flesh and started to lead a life of a drunkard and a sexual athlete. Accordingly, he wrote a lot of beautiful songs about love and drinking. His poems are still sung by Irish language singers: the tune of Boolavogue is also that of Mailí Mhodhmhar by Cathal Buí."
That's the same Cathal Buidhe that wrote An Bonnán Buí (the Yellow Bittern)
Also I see Conall Ó Domhnaill recorded the song "Molly Mhodhmhar" on CIC045 "Ó Ghlúin go Glúin" so you could also ask Cló Iar-Chonnachta for the words (as well as asking the company that record the C Ó Gallchóir album that you have)

thanks Mudelf, for the quick work!

fáilte romhat, a chara! - an mhudelf ;-)