Mr. Pop History – I point to the 1990 release of “Louder Than Love” by Soundgarden.
Then on to 1991 – when Nirvana “Smells Like a Teen Spirit” was released. Then – Pearl Jam gets its name on the cover of Rolling Stone.

1992 – Nirvana is on the cover of Rolling Stone and the magazine describes Seattle as the new Liverpool. Pearl Jam’s debut album – “Ten” sells a ton. Vogue magazine featured grunge fashion, which was typically, flannel shirts, untied combat boots, knit caps, mismatched stripes and disheveled hair. There’s more, but this is a good start.