As said by Metallica fans:
Also known as early Metallica. A time period in Metallicas lifetime when their highest quality music was produced and before they sold out to the music industry and became complete hypercrites. Usually the time period is before Load or the Black Album was released, depending on how you look at it.
Kill 'Em All, Ride the Lightning, Master of Puppets, And Justice for All
Kill 'Em All, Ride the Lightning, Master of Puppets, And Justice for All, Metallica(Black Album)