Slayer: Reign In Blood. When Slayer released their masterwork in 1986, Thrash Metal was still in its infancy. Bands were still finding their feet, and the music was still being shaped and formed. What Slayer did with this album was define the genre absolutely. In my opinion, no other extreme metal band has ever bettered this behemoth of relentless, brutal beauty: not even Slayer themselves. A stone-cold classic. It also reminds me of being young; always a good thing.