There are many threads on the mixup between tunes for Waltzing Matilda.

Here's a start:

http://www.mudcat.org/thread.cfm?threadid=3857#241337

http://www.mudcat.org/thread.cfm?threadid=21239#226918

http://www.mudcat.org/thread.cfm?threadid=28379#351946

http://www.mudcat.org/thread.cfm?threadid=13177#108322

http://www.mudcat.org/thread.cfm?threadid=29578#374716

The tenacity of myth and half truth and the power of PR.

I reckon Waltzing Matilda was actually based on hunting tune from Tierra Del Fuego and the words were written by Henry Lawson Norwegian Grandmother!