Well, the cycle is complete: Lesson Six on Polyphony is up. I’d love feedback from experts in audiospectrographic analysis in particular, because I may have messed up on some of the details this time around.
Of course, no sooner do I finish my lesson than I think of all the ways in which I could improve and expand it. I may work on that down the road. Meanwhile, the six-part series on this site will teach you basically everything you need to know about reading avian audio spectrograms. Enjoy!