Backcrossed, associating with blue-winged warbler
Plumage was dead on for a blue-winged warbler, but its call was consistently many buzz notes. There are at least 3 individuals present that all called the same way, much more like a golden winged.
There are also several individuals at this location that have the typical two-note blue winged buzz call. It is very odd. some of them may be hybrid individuals (bird in photo is the same bird as the spectrogram).
Brewster's
Crops.
Taken unknowingly sorry for quality.