Ain't no drab goldfinch

For a while I have been seeing this bird dart around our yard and until today I assumed it was a drab goldfinch. But today I got a clearer view and realised it wasn't a goldfinch at all. And thus I added a bird to the list of those I have seen and identified. It is, I am pretty sure, a yellow-bellied fly-catcher. And it was enjoying the flies in our cherry trees.