@Setanta,
You mean when Dennis Day sang "O Danny Boy" on the Jack Benny Show (in black and white) you did not get misty eyed, even though a young lad?
Regardless, I have heard that NYC has an amazing amount of Irish culture, even though the demographics is not the 1/3 of all New Yorkers, as it was in the 1950's. NYU has Irish house, so Irish musicians, etc. can stay there when in New York. The Bronx still has a neighborhood where many young girls enjoy step-dancing, as elsewhere in the tri-state region.
And, as I was told by a close relative, if anyone in NYC, in the early 20th century wanted to appear more American, the advice was learn to speak like the Irish.
Watch any 1940's black and white movie that takes place in NYC and notice all the Irish names that are in the script for the newpaper reporters, lawyers, etc., etc.
NYC would not be what it is now, if it was not for the Irish having been one-third of its population in the first half of the twentieth century. Many other groups are now enjoying the labors of a few generations of Irish.
P.S. I remember a NYC where my mother told me as a child that if I was ever lost, go to a nice policeman (that was likely of Irish descent). They made the term New York's Finest a truism.