I love the heavy metal band Metallica have you heard their music before?
They are great! Metallica is an American heavy metal band from Los Angeles
I know I'm for LA I went to their concert people go crazy for them.
The band was formed in 1981 by drummer Lars Ulrich and his best friend James Hetfield.
James Hetfield is my favorite his voice is none other out this world did they win any Grammy or awards i can't really remember? 
I think they have one a few.  The band's fast tempos, instrumentals and aggressive musicianship made them one of the founding "big four" bands.
Who was all apart of the big four besides them seems you know more than me about Metallica lol.
I think it is Megadeth, Anthrax and Slayer.
I never heard of Slayer I would say Metallica is still the best.
The band's third album, "Master of Puppets" (1986), was described as one of the best albums ever!