I don’t know whether this page will ever amount to much because I tend to buy CDs (very old school I know) and rip them into iTunes. The My iTunes widgets list what you’ve purchased, and I don’t purchase much from iTunes (but that may change as they improve the bit-rate quality of the music). I have purchased more than is shown here, but having recently changed the details of my iTunes account (it was based on an old e-mail address) most of my purchase history has disappeared.