Podcasts
Podcasts are great because listening to the same music day in and day out can become very mundane and boring (for me anyways)
I found a wealth of affiliate marketing podcasts for free on itunes. Now the thing that a WA member has to know is there are lots of other marketing (scams) programs out there and many of these podcasts are talking about them, how wonderful it is and how its the only one out there that is any good. I tend to have selective hearing when it comes to that.
They do offer some good information however and its nice to listen to other like minded individuals. Who knows, you might learn something that you would not have if you had not listened in. And they are good backround noise to have while you are working. I like to keep my pad of paper and a pen handy in case I hear something I like.