My understanding is that most people perceive relative pitch in music (is this note higher or lower than the other notes around it) but not absolute pitch. I'd expect people to have to no trouble teasing out the indentation of a stretch of code, but if you hear just a few words out of context (which you do a lot with a screen reader... I'm not blind but I've been tasked with making sites accessible and spent a lot of time w/ NVDA) you will probably lose the thread.