One of my all time favorite bands is Metallica, are you familiar with them?
Of course! They are classic. The Unforgiven is my favorite song by them!
mine too, it was released as the second single from their eponymous fifth album Metallica
When did they first release an album or single?
One" was the first Metallica song for which a music video was created i found really incredible knowing Metallica 
Awesome! What was their most popular album?
Metallica
Metallica is an American heavy metal band. The band was formed in 1981 in Los Angeles, California, by drummer Lars Ulrich and vocalist/guitarist James Hetfield, and has been based in San Francisco, California for most of its career. The group's fast tempos, instrumentals and aggressive musicianship made them one of the founding "big four" bands of thrash metal, alongside Megadeth, Anthrax and Slayer. Metallica's current lineup comprises founding members Hetfield and Ulrich, longtime lead guitarist Kirk Hammett and bassist Robert Trujillo
The Unforgiven (song)
"The Unforgiven" is a power ballad by American heavy metal band Metallica. It was released as the second single from their eponymous fifth album "Metallica" (also known as "The Black Album"). Though one of the slower tracks on the album, its chord progression is distinctly one of the heaviest. The song deals with the theme of the struggle of the individual against the efforts of those who would subjugate him.
The song has since spawned two sequels, in the