Best Heavy Metal Album Ever

Master of Puppets is the best heavy metal album.
It was made by Metallica in February 21, 1986,  and until now, was sold more than 6 million of copies only in USA. 
The British magazine MetalHammer and the site MusicRadar.com promoted a poll to identify the best heavy metal album ever, and the winner was Master of Puppets

The tracks oh this album are:

1. Battery

2. Master of Puppets

3. The Thing That Should Not Be

4. Welcome Home (sanitarium)

5. Disposable Heroes

6. Leper Messiah

7. Orion

8. Damage, Inc.