I have been informed that my unidentified singer is a Yellow-throated 
Vireo.

I knew I'd heard the song many years ago and thought any 3-A variation 
should be a vireo, but today it didn't match up with the any of the 
vireo songs on my bird-pod.

In all the years of the Atlas Project and the June of Prettyboy Bird 
Blitzing, I did not hear this song variation.  I did have one pair of YT 
Vireo for the atlas and a few in the Bird Blitz, but they all sang the 
song that is on the Bird-Pod.

All the techno-gizmos in the world don't replace lots & lots of experience.

Georgia McDonald    Towson, Balt Co.