I read every book there was on jazz, about the original players - King Oliver, Buddy Bolden and all those groups. At one time I was fairly well schooled in that... I could tell you who played where and when, historically, way before my time.
I think one of the few faults in Dickens is that mostly his lead characters are blanks - who is David Copperfield, who is Oliver Twist? And yet he takes such joy in populating the rest of his novels with these fantastic, grotesque people like Pecksmith and so on.
I read everything. I'll read a John Grisham novel, I'll sit and read a whole book of poems by Maya Angelou, or I'll just read some Mary Oliver - this is a book that was given to me for Christmas. No particular genre. And I read in French, and I read in German, and I read in English. I love to see how other people use language.
For delightfully quirky descriptions of bizarre neurological syndromes that teach us a lot about how the brain works, there is no match for Oliver Sacks.