You people are crazy saying "Oh you are just ruining it for yourself."
You aren't ruining crap, listening to an album for the first time whether it's a month before it comes out or right when it comes out is the SAME.
You think I am any more happy about the album because I got the CD in my hands when it has just come out? No, I am going to have the same opinion as if I downloaded it. I did, and it was awesome.
You aren't ruining it for yourself by downloading it, you are simply stealing music. It's not going to be any different for you whether you download it or buy the CD.
IMO as long as you plan to buy the CD, download it and listen to it. You are getting it a month earlier.