I'm not familiar with the band Metallica. Are you a fan?
They are actually my favorite band.  The were created in 1981 by Lars Ulrich and James Hetfield
What are some of their songs?
There most well known song is Enter Sandman.  It led to their album selling over 30 million copies
Wow! That is quite an accomplishment. How were they received critically? Did they receive any awards?
heavy metal, appealed to a more mainstream audience, achieving substantial commercial success and selling over 16 million copies in the United States to date, making it the best-selling album of the SoundScan era. After experimenting with different genres and directions in subsequent releases, the band returned to its thrash metal roots with the release of its ninth album, "Death Magnetic" (2008), which drew similar praise to that of the band's earlier albums.
In 2000, Metallica led the case against the peer-to
Enter Sandman
"Enter Sandman" is a song by American heavy metal band Metallica. It was released as the first single from their self-titled fifth album, "Metallica" in 1991. The music was written by Kirk Hammett, James Hetfield and Lars Ulrich. Vocalist and rhythm guitarist Hetfield wrote the lyrics, which deal with the concept of a child's nightmares.
The single achieved platinum certification for more than 1,000,000 copies shipped in the United States, spurring sales of over 30 million copies for "Metallica