I had no problems getting my LED to light up, but it did require tapping on the electret. The electret I'm using just doesn't appear to be as sensitive as the one used in the book... or I may have a wiring issue. Capacitors and resistors are all unique, so it's quite possible I just have a combination of components that isn't helping increase the sensitivity of the electret. Tapping on the electret, however, does yield results as you'll see in the video.
What I'm taking from Experiments 9 and 10 are an understanding of the concepts of a split voltage supply, amplification, and the function of the LM741. The experiment may not behave exactly as desired, but I understand what I'm supposed to see when this circuit is powered up.
Up next is Chapter 11 and Experiment 11 -- the chapter is somewhat involved and lengthy, and I'm only one read into it... I'm going to read it again and try to tackle all the parts involved over the coming week. There's a LOT to learn and absorb, so if you're heading towards Chapter 11... prepare for some good stuff.
Video for Experiment 10 below...