That verse should read:

"When Irish Eyes Are Smiling" and "The Mountains of Mourne"
In his search for Celtic cliché he has left no stone unturned
Till he embarks upon "The Harp Once Through Tara's Halls"
Accompanying himself of the bodhrán which takes a lot of balls
He's just a plastic paddy, singing plastic paddy songs
In a plastic paddy pub that's called "The Blarney Stone"
He's just sung in his mother tongue, the ancient Irish Erse
And cleared the pub completely by the forty-second verse