I can't code and listen to speech audio at the same time. I can do it if I'm only pattern-matching or doing something that is only visual and doesn't take much conscious thought. I used to listen to audiobooks at an old job whenever I had to do tedious work, digging through spreadsheets for anomalous data. And, I now listen to audiobooks while I'm riding my bike or exercising.

I figured that it was because coding, or writing something like this comment, uses the speech center of my brain, as does the incoming audio stream. Music doesn't have any adverse affects on my ability to code or write comments, since I don't really pay attention to any of the vocals that may be present.