It was never technically 'introduced'. When bands like Nirvana became especially popular after starting out in the late 80s but exploding into fame in the beginning of the 90s, they in particular helped spread the laid back 'grungy' movement of music with their music and image.
Grunge rock was originally performed in Seattle Washington.
Alternative Rock/Grunge
Probably more Grunge but not heavy into Grunge.
Grunge then rap-metal
Alternative Rock/Grunge
It was a derivative of punk. As punk rock was becomming accepted grunge came about. It is a darker, more robust version of hard rock.
Nirvana is grunge/rock music.
How can it be when there are so-called Christian Rock bands? Music is simply music. It isn't satanic rock music is satanic! if you play some rock songs backwards they blaspheme jesus christ
No they are garage/grunge rock.
grunge
Grunge then rap-metal
Alternative Rock/Grunge