I think the loud, clicking call, like a bird from a thirties Tarzan movie, that's the Jay's mating call. It explains why there's so few of them.
The other noise is kind of like the caw of a raven or crow, but not as melodious.
At six am, it's an effective wake-up call.
It means "sure is a nice place you have here… and the suet feeder has run out …"
I plan on yielding.