Great literature should do some good to the reader: must quicken his perception though dull, and sharpen his discrimination though blunt, and mellow the rawness of his personal opinions.
No one bothered reading the books and understanding - and again, I'm not being high-falutin' about it - but I think our books are great literature with great metaphors of real life dealing with fears and hopes.
To me, characters are at the heart of great literature.
Great literature is simply language charged with meaning to the utmost possible degree.
It's what's missing, I think, from most music - the rebellious part. That rebelliousness is part of great rock music or great literature or any great creative stuff.
When I read great literature, great drama, speeches, or sermons, I feel that the human mind has not achieved anything greater than the ability to share feelings and thoughts through language.
And in down times it shakes a lot of the bad SF out, a lot the stuff that was bought for literary reasons, which is neither entertaining nor great literature.
I never wanted to become an actress because I'd read great literature or seen great Shakespeare. It was more just wanting to understand what the people were really like, why they said all the strange things they did.
Novelists get to say plenty in their massive tomes; rock singers only get four-minute songs with two verses and a chorus' worth of lyrics, and so there's a real pleasure in accessing the intelligence behind the music, even if it doesn't qualify as 'great literature.'
Hopefully, reading and being around great literature inspires me to write songs, but I'm not sure about that.