Hi! I'm a teacher and a musician who needs some iPad advice. I have a big collection of various music theory books, sheet music and orchestral scores in PDF. I would especially like to have a more practical experience using electronic sheet music while playing the piano or listening to music. How does reading PDF files on an iPad work compared to my MacBook Pro/Air? I'm not familiar with the iOS system, so I'm wondering how easy it is to organize folders and files on an iPad. Can I group a big collection of PDF files into specified folders or groups, or having various htm text files on my iPad opened in Safari as local bookmarks (I have an offline version of the entire The New Grove music encylopedia)? Also, does iBooks provide a clear and HQ image of PDF files? I notice on my macbook that Adobe Reader Pro has a much more clearer PDF image quality, than (mac) Preview which makes several of my PDFs look blurry. I don't have a big budget these days, so I really have to weigh this purchase carefully. Any good tips or advices would be greatly appreciated. Thanks!