Aqui está uma resposta detalhada que recebi:
All of the folders in the iTunes 9 section appear in the iTunes folder along with all of the files that are listed below. If you want something other than iTunes to be displayed at the top of the iTunes window, you could rename the iTunes folder to something else (for example, I keep 4 different iTunes libraries on my external drive in separate folders called: Main Library, Gig Music, Jamey Aebersold, and Omnibook. These names appear at the top of the iTunes window.)