Here is a reference to "A Hundred Years Ago" from a journal kept aboard the "Agincourt" on it's way to South Australia in 1848. The verse given is as follows:

"A hundred years is a very long time,
    Oh-ho! Yes! Oh-ho!
A hundred years is a very long time,
    A hundred years ago.
They hung a man for making steam,
    Oh-ho! Yes! Oh-ho!
They cast his body in the stream,
    A hundred years ago."

And the entry mentions that "Other favourites included:
   "Sweet Belle Malone"
   "Off to Botany Bay"
   "Sailing over the Ocean Blue"
   "Can You Bake a Cherry Pie".

The introductory comment is: "They were like monkeys moving swiftly aloft up the ratlines and sang Sea Chanties as they worked. ("Chant" is a French word)"

This comes from a posting found on the internet entitled BOUND FOR SOUTH AUSTRALIA - AGINCOURT 1849-50 Journey by Diane Cummings. It looks like it is primarily concerned with the passengers list and has to do with genealogical research. There is no further documentation. Here is the link:

http://www.slsa.sa.gov.au/fh/passengerlists/1850AgincourtJourney.htm

I have not found other information on this particular "Diane Cummings". But here is a reference to the "barque Agincourt" making another voyage to Australia that is dated 1852, from OUR ANTIPODES: OR, RESIDENCE AND RAMBLES IN THE AUSTRALASIAN COLONIES by Lieut.-Col. Godfrey Charles Mundy:

http://books.google.com/books?id=MVgBAAAAQAAJ&pg=PA2&dq=barque+Agincourt&lr=&cd=20#v=onepage&q=barque%20Agincourt&f=false

There are numerous other references to ships named "Agincourt".