Jenny,
Re your mystery bird - There are plenty of orioles along the lake and their
song patterns can be rather erratic. Down here in the piedmont they have
pretty much stopped singing, but up there on the plateau they could still be
at it. Or is their song already familiar to you?
    I must say, for a beginner your attention to detail on song is
impressive. I'm not going out on a limb by saying that you'll be an expert
before you know it.
    Please keep posting as you build up your list. It's very refreshing to
all of us to see the enthusiasm you bring to this. We all went thru it. It's
nice to be reminded.
    Jerry