Before the release of their third studio album, Metallica was an up and coming thrash band playing hard and fast metal for fans to swing their necks, bang their heads and throw up their fists in a repetitive motion.
When they released Master of Puppets in 1986, the band really pushed the limits of musicianship, bringing heavy metal and thrash metal to the forefront, requiring technical musicians outside the genre to pay attention and admit this band knew how to play their instruments and knew how to write impressive lyrics.
