Apple iTunes is one of the biggest source of music sales today. Accessing the content on Apple iTunes was officially exclusive to the software that is required for download. But now the walled garden company quietly rolled iTunes music, movies, music videos, and TV episode descriptions to the web in a new feature called iTunes Charts.
iTunes Charts is not exactly the same content that is showed on the desktop software but rankings are being shown for the various categories. On the web you can browse the top 100 in each category.
The problem with iTunes Charts on the web is that you cannot preview audio clips or buy the track on the spot. You still need the desktop software for that.