On another corner of the house, is this little leaf lilac (Syringa microphylla var. pubescens 'Superba' - I think it was labeled). It blooms (not quite as heavily) again each Fall.
And around on another corner, are these two closely related yellow-flowered, Spring blooming Asian rose species, Rosa primula (the light yellow in the back) and Rosa xanthina (the three darker yellow blooms at the bottom of the picture).
You don't even need to be close to these shrubs to enjoy the scents!