I have been keeping out of this thread in case we are talking about something different / more recent than the Jack Dolan/ ~Doolan/ ~Donahue/ ~Donahoe/ ~O'Donoghue/ &c variants of The Wild Colonial Boy. If it is indeed The Wild Colonial Boy, then the question (answer only known to those who have heard Clancy, O'COnnell and Clancy do their version) is what tune? (...which tune?).
At least here in Australia, where it started off (poem written by "Frank the Poet" around 1832) it has been found with about 36 different tunes. The oldest traceable was that of Wearing of the Green and it used to be thought that this was the original, however this now seems unlikely, unless it was pinched from its Scottish original before Dion Boucicault pinched it for his song, which appeared in the play Arragh Na Pogue, in 1848.
It was thought that all the other tunes arose because Wearing of the Green became classed as a "Treason Song" for which the singer could be arrested and charged. (This was during the latter part of the 19th century in Australia ... and, I have heard, up to 1960 in New Zealand!).