It's difficult to tell whether a Thrasher is on her nest in the Apple tree. If you get too close, and she is there, there's panic and mayhem and flying around and a general sense of disgruntlement that passes through the community of birds and ends up with a communication to the Summer Tanager asking him to start singing. I am firmly of the opinion that no one enjoys the Tanager's song, so he just jumps at any request made of him to exercise his voice.
The theory is with Tanager's, the boy sings only when attempting to seduce an
unfortunate girl Tanager. Like a lonely boy Bobwhite, who will follow an engaged
Bobwhite couple around calling intermittently, on the off chance that the boy
side of the engaged couple will succumb to something like a raptor or big snake
or somebody's feral Pussy Cat or some mental patient with a shotgun and one of
those horrible little hunting dogs. With Tanager's I have decided their need to
irritate the neighborhood lies somewhere in their desire to rule the universe no
matter the cost to others.