Apart from the lyrics and the art which I love to examine again and again, I particularly like reading the thank you list of the band and of each member. There are sometimes some ammusing notes there or some serious things that clarify certain aspects of the album. In metal albums this is particularly interesting. The band thank you list helps you see who's friends with who. For instance Blind Guardian and Iced Earth always used to mention one another in their thank you's. THey even refered to one another as Iced Guardian and Blind Earth. Hence the collaboration Demons and Wizards. Death, for example, or more accurately, Chuck Schuldiner (RIP) had always something to say. In Human for example you can understand his complex relationship with the media and certain critics and industry people and other "malevolent" people who were spamming him - He says there something like this: this is more than a record to me, it is a statement, it is revenge!. It is also interesting to see the lineup and the guest musicians (if any) to understand relationship between bands and to understand where some influences might have come from. For instance, Wobbler's multi-keyboardist is a member in White Willow. THe producer of their album is Holm-Lupo, WW mainman.