Mystery Birds

These beauties have been gracing us with their presence every year since we moved in 3 years ago.  They seem to travel in groups of about 3 to 7 and they come to our yard to secretly visit in our two potato bushes.  They have these gorgeous long tails and peaked heads and we usually see them late afternoons in certain times of spring summer and fall.  Can anybody help me by telling me what kind of birds they are? I'm so fascinated by them and would love to know!