he has. he opened our minds to real music.

Who has?

And as we know from the other thread Real Music = anything with grungy riffs

No, he popularised a genre of music. He isn't as important because he took ideas from other bands and put them together... Beethoven was a genius... Kurt was an artist. Not quite a genius. I love grunge and Nirvana, but he isn't as important to musical development.

what ideas did he take?

He took the grunge idea, and put beatles with black sabbath. Melody and Aggression. He wasn't the first, but he did it well.

he didn't take the beatles or sabbath...
all of his ideas of his songs are about his life.

Yes he did. He is quoted as saying he made the band to blend the aggression and melody. He was a huge beatles fan, they were his favourate band. Doofus.

i know he liked the beatles. and i knew it was his favorite band but..that doesn't mean he took their ideas.

He apparantly wrote About a Girl after he listened to Meet the Beatles for a few hours. Unsurprisingly it sounds like a Beatles song!