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@Waxwing
Thanx, man. It seems like I finally got good simple rule for "to have something done / to have done something" usage. Your student are lucky to have such a good teacher.

But isn't "he had it sung" equal to "he was singing it and finished singing it in the past"?

Maybe I sound stupid 'cause of my poor english, but I was always tought (even by americans) that:

he sang the song
and
the song was sung by him
or
he had it sung

I may be wrong though...