Using booklets in iTunes
Some albums you buy in the iTunes Store come with interactive booklets or digital booklets. You can purchase and download these booklets as part of an album or other offer. A booklet appears in the iTunes Store and in the iTunes library with a book icon next to it. Booklets, formatted as PDF (Portable Document Format) files, are usually electronic versions of printed documents, such as album liner notes.
To open a booklet:
Double-click the file.
The file opens in your default PDF viewer application. If you don’t have a PDF viewer application, you can download Adobe Acrobat Reader at the Adobe website.