Worst bird call ever

I've been here for about 3 months and I've been haunted by a common bird call. It was a pretty awful bird call--loud, but as if it didn't really care--plaintive, if you will. With the bird 3 feet away and singing at my face, there was no way to locate it. So I'm very happy that finally the bird popped up.

And here it is--a plaintive cuckoo.

Actually, I saw the female earlier at the zoo, but females are very tough to identify.

It's hard to find an authority on Vietnamese birds. There lots of birds but Vietnam has the lowest ecological awareness. I'm trying to work with a limited photographic guide and a denser illustrated guide without range maps. Amazingly, googling Asian bird calls is absolutely fruitless.

I know that my 2 readers are not bird watchers, but I hope this will turn up in a google search so that others won't be confused by the plaintive cuckoo. Here is my rendition of its 2 calls:

Plaintive Cuckoo (UPDATE: Sadly, my rendition was long wiped from the net--maybe it was too good? Hear the actual call HERE.)

I'm considering being the one authority of Vietnam bird calls. It will be a lot of work, but I already have the album cover: