They also feel like they occupy a weird middle space. They aren't as low-attention as something like television - without the visual component you need to pay attention more to 'get it' and follow along.
But it doesn't feel right to sit there and solely listen to it while doing nothing else. But I'm not sure what else you can do that doesn't eat up enough concentration to follow along. Cooking or cleaning maybe? Things that you can do from muscle memory.