What Is This?

Here's a mystery for you ---- any idea what this flowering tree/bush is?

We have two of these bushes along the side of our house and each spring they bloom and give off the most lovely aroma. I suppose that there is no reason to really worry or wonder about what it's name is, but I love it enough to want to know more about it.

I did try a Google image search on it, but it turns out that there are many, many aromatic flowering tree/bushes. So .... I'm appealing to my neighbors. Does anyone have one of these?