Trish, I believe that previous discussion has established that "Belfast Hill" is a variation of Si Kahn's "Aragon Mill," which is in the database (put Aragon in the search box in the upper-right corner of the page. I'm sure you'll find another of your longs if you put [long black veil] in square brackets in the search box - the square brackets make the database search for an exact phrase. Click here and click here for previous discussion of "Belfast Mill."
Mo Ghile Mear (click here) is in the database - you really should have looked first....
A forum Search turned up Irish Heartbeat (click here).
Click here for a discussion of "Barley Mow," and search the database for [barley mow] and you'll find the song.
OK, so that's a good start for you. Next time, how about searching the database and the forum first, and then asking for the songs you didn't find? In fact, it's best to start a new thread for each song you want, with the name of the song in the thread title - but first search to see if the song is in the database, or if it has been posted in the forum. Otherwise, people may start muttering things behind your back....
-Joe Offer-