Oy! Such a day. Like Sherlock Holmes, I am on the search for the missing song. A Victor Herbert song "Blarney Is Our Birthright," while not published in the vocal score for HEARTS OF ERIN, did appear in the Boston and Cleveland performances of the operetta before it was shut down for overhauling. It did not make the final version of the score for EILEEN, and I can find no record of the song being published as a single sheet with the HEARTS OF ERIN logo. To complicate issues further, the Ohio Light Opera recording of EILEEN includes the song and I have no idea where the hell they found it. It might be a fake song written by the OLO production team, though I doubt it.
There's no copy of the song at the NYPL, and I've been through the show programmes as well as the show music folders. I am not happy at the moment. I'm determined to find this number.