Lilac Syringa. The yellow objects are old flowerheads, but without any developing fruit (so it may be a sterile double-flowered cultivar).
Spent Syringa vulgaris heads I've seen look different, this seems more likely to be flower buds of a different kind of plant - maybe growing beneath the lilac.
Thanks for the ID confirmation. I thought it was a lilac, but I think the flower heads threw me off.The leaves and twigs are very distinctive however. Thanks again for your help. Curious Arborist