I had to check the Internet to make sure of whether both of these birds were blue or black drongos. After all, they both have a bluish tint to them. Blue drongos, though, are a more vivid shade of blue than the one you see above. At the time I photographed them, I couldn't tell the difference. In the pictures, however, I can see it.
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The one you see perched by the building (the nearby rice field is off camera) is a blue drongo.I was fortunate that day. It was the first time I'd photographed either species of birds, and I photographed both in the same day.