Singing Northern Parula in Lamar,CO

I know, not a very good pic but this warbler was not being cooperative. Though it sang for a little while, it spent most the time foraging in thick weeds where I only got brief glimpses. However, this pic does show much of the field marks for a male of this species-- bluish upperparts with a green mantle, yellow throat with a dark colored breastband (actually black and rufous but colors not clear in this pic), white wing bars and even showing some of the white on the belly. SeEtta