>>127503351
i think Grunge falls in category between genre and movement/scene, there are some similarities between bands specially in guitar tone due to most of them being from Seattle or areas near Seattle(or influenced by bands from there).
But yeah, it's kind of like post-hardcore or nu-metal, in the sense that it describes a movement of various sounds rather than a straight genre.
Nirvana is more post-hardcore and punk with some metal ala Black Sabbath here and there
Alice in Chains is metal
Pearl Jam is classic hard rock,really bluesy
Soundgarden is metal/hard rock/stoner depending on the album.
That said they all share a somewhat similar guitar tone aesthetic and attitude
>>127503655
Supersonic Grunge? it's a great song but is not grunge at all, more psychedelic and maybe a little garage rock.