Lots of activity at the pond today.
Black throated green, Nashville, Blackpoll,Cape May, Redstart, Red breasted nuthatch plus others.
Up to 20 hummers in the yard, none of the photos begin to show the activity, so you get the black-throated green.
The male Black-throated Green Warbler sings persistently during the breeding season. One individual was observed singing 466 songs in one hour.
source - Cornell Lab of Ornithology.