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How many other countries aren't in Europe performing.
It's not Europe by usual definitions of Europe but the ITU European Broadcasting Area which spreads quite a bit further east and south than you might expect. Presumably because coordination of things like frequency overlap makes sense over that area.
Australia is just 'cause they are mates.
(MateSong: Greatest tourist board advert ever. Unfortunate timing.)
Rumours abound that The Wiggles are going to represent Australia at Eurovision next year.