Hello Vermont Birders:
Thanks Larry and Charlotte for your prompt replies. They inspired me to do
a little digging at The Birds of North America Online
The noted lull in June/July might be addressed by this quote from the
account: "Singing rate decreased after egg laying."
There wasn't a lot addressing a "second singing season" but I suspect it
might be a little post-breeding dispersal. It might also be explained by
this quote from the account: "After fledging, young produce call very
similar to adultís *fee-bee-o* and progress further towards adult song
structure during first 2 mo of life."
Either way, I am going to enjoy it while I can because they will not be
around much longer.