How do we locate the lyrics to the chorus? I'm the last person on earth who can identify the Gaelic text by ear from the recordings.

The chorus is a quatrain, four lines. The first line sounds like

"is 'o-ro-way o-ro-way' buachaillin brea"....

while the forth and final line sounds very like the line that concludes the final verse:

"go n-ólfaimid sláinte Chill Mhuire."