Try listening to the songs of people like Joe Heaney one of the great Irish sean-nos singers to get the real flavour of Irish songs. As for the comment that many "Irish" songs are in "English" has it crossed your tiny mind that many of the people who wrote the originals had to earn a living and like most people had to satisfy the mass audience of the day? Take Thomas Moore for example the author of "Moore's Melodies" which include such numbers as "The Minstrel Boy", "The Harp that Once", "The Meeting of the Waters" and many others. If he had written them in Irish which at the time was a language which was regarded as alien by the then government, how many would be available today? Don't forget such great groups such as Clannad, Annuna, The Chieftains - shall I go on?