Now, what is an LP?
iTunes-OTHER, Windows 7
There is a description on this page : http://support.apple.com/kb/HT3823
iTunes LP and iTunes Extras offer a unique and interactive experience with iTunes; both are available for select album and movie purchases on the iTunes Store.
When you purchase an album with iTunes LP, you receive the songs from the album, plus special features* such as lyrics, photos, videos, credits, and more. When you buy a film with iTunes Extras, you’ll receive the featured movie and chapter selection along with special features* such as movie stills, deleted scenes, exclusive interviews, and behind-the-scenes footage.
*Note: Special features vary by title.