just wrapped a record with a band that spent a few days with him to see if they wanted to do this record with him. many, many first hand stories i found rather fascinating.
my favorite is:
supposed to be doing a co-write with him, band is rehearsing for hours, no producer. he finally shows, tells them he'll teach them how to really play. says he'll show them things they never thought possible, i.e. "i'll show you that there really is one note past G, it's H and i'll teach you". they commence working on the song, he wants to change the chorus, they discuss and mildly disagree, he gets enraged, and says, "let me go talk to my gold records about this" leaves the room and never returns.