Michael Robinson just recently found and added the Gaelic verses to the "Young Man's Dream" (the apparent original of "Londonderry Air" used for Danny Boy") in his history of the tune. Go to
www.standingstones.com/dannyboy.htm
And for two earlier versions of the tune (and another of about 1800) go to S1.ABC, the tunes file for songs at
www.erols.com/olsonw
The apparently older English verses are there, too, in the SONGTXT1.TXT file, as is the unreprinted earlier English broadside ballad "Love's Fancy, or The Young Man's Dream" (and its 17th century English tune)