Back in my teen years I knew the lyrics to just about everything I listened to off by heart. Metallica, Slayer, Anthrax, Iron Maiden, Exodus, Megadeth, Death, Morbid Angel, Suffocation, etc. Nowadays I don't really pay much attention to lyrics because it's too much time and work to learn them. Although I do ocassionally enjoy reading lyrics for a laugh(ie. Anxl Cxnt, Cannibal Corpse, The Mentors, etc.).