How do I add the music category to my iTunes Store?

I used to have the "music" category on iTunes Store on my previous computer.


I recently got a new computer and downloaded iTunes, but only have an "Applications" and "iTunes U" category in my Store.


How do I add the "Music" category to my iTunes Store to listen to samples of songs?|||Hm, I have same problem and tried to find the answer, and finally found. Here the link to discuss forum: http://discussions.apple.com/thread.jspa鈥?/a>