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?
Ride the Lightning, is their most popular album, despite Metallica's current lineup comprises founding members Hetfield and Ulrich,
Wow! Have they come out with anything recently?
I don't know toi be honest i just know that  bassists Ron McGovney, Cliff Burton and Jason Newsted are former members of the band
Well it would be nice for them to do a greatest hits tour or something.