A lot of people post lyrics without tunes; at the moment we're having a bit of a drive to make midis of as many as we can find.  I believe that someone has done Lagan Love; in the first instance it will appear at Alan of Oz's Mudcat Midi Site, which is a sort of staging-post for tunes that haven't made it into the main database yet: you can find it in the "Quick Links" box at the top of this page.  It probably won't appear until the Olympics are over, though!

Malcolm