I'm a noob when it comes to bying CD's and such (I've never bought a CD in my life before, lol). Those ''HD tracks'' are something I've never heard before. I always thought when you buy CD, it's the best sounding version possible, and it's always better than listening to it on youtube, and such. But wait, you're telling me if you buy regular CD, you're actually not getting the best sounding version possible, or what? I'm confused now :S