This song (and it's history) was discussed on a thread maybe 12 to 18 months ago? - about Aboriginal / Indigenous Music, I think ...
Written by Harry Butler and Rolf, but based on the real thing - I think that info is on his website anyway ...

It's what we call an Indian Song - seminal.

(Seminole - get it?!)
Yeah, okay, but I'm not altogether well, at present!!

Cheers!
R-J