I think I may have found some info that deserves deeper research, and this is related to Pizzagate because it is related to the music industry, politics, and child molestation.

On page 202 of the book titled "Elvis Costello, Joni Mitchell, and the Torch Song Tradition", it talks about a photograph of a politician kissing a baby that was supposed to mean "Kiss them now, kill them later." Costello describes this as the "ultimate act of betrayal," then immediately talks about his song Tramp the Dirt Down and how he wants to witness Margaret Thatcher's burial and help stomp the dirt down. Remember that Margaret Thatcher was good friends with Jimmy Savile.

Then, on page 221, the text talks about a song that describes a child getting molested in a church.

https://books.google.com/books?id=OO5hQBVPoOAC&pg=PA221&lpg=PA221&dq=joni+mitchell+molested&source=bl&ots=SWWFvBSFrR&sig=ojeQYbUeaGJkeYqW3noumvbHd1E&hl=en&sa=X&ved=0ahUKEwjcvJySudHZAhXH0FMKHe0fA5IQ6AEIWDAG#v=onepage&q=joni%20mitchell%20molested&f=false

He's got my full respect here, too:

On 15 May 2010, Costello announced he would withdraw from a concert performed in Israel in opposition to Israel's treatment of Palestinians. In a statement on his website, Costello wrote, "It has been necessary to dial out the falsehoods of propaganda, the double game and hysterical language of politics, the vanity and self-righteousness of public communiqués from cranks in order to eventually sift through my own conflicted thoughts." https://en.wikipedia.org/wiki/Elvis_Costello

But Shipbuilding resounds with an intense political anger, I say. “Yes, but I didn’t think it was going to stop the war. I don’t really want to be called political, because, you know, who is political? Politicians. How many of them do you want to call friends? Not very many.”

His talk of politicians gives me an opening to ask him about his native England, which he quit for Ireland, then the US, and then Canada, where he now lives with his jazz-pianist wife, Diana Krall, and their eight-year-old twin sons, Dexter and Frank. No point beating about the bush: what does he think of David Cameron? “I try not to think about Cameron. I’ve just eaten!”

And Jeremy Corbyn? Costello says he’s been amused by the way the rightwing press is portraying the new Labour leader as a major threat to British national security. “Corbyn can’t actually change anything, even inside his own party. So what are they so afraid of, if not another opinion? He’s just expressing views that are different from theirs – I thought that was democracy.” https://www.theguardian.com/music/2015/oct/16/elvis-costello-interview-people-have-no-idea

Gee, I wonder what turns his stomach about Cameron?

And what about Joni Mitchell? Was she abused as a child, then allowed her daughter to be abused?

In the book "Dancing in Hell" by Daniel West, there's a chapter titled "Making Her Case for Her: Both Sides Now - Joni Mitchell" where the narrator describes a young girl being molested by her uncle and the girl's mother allowing it to happen because she was also molested by the same relative. Scroll until you see the chapter title. Unable to copy and paste text. https://books.google.com/books?id=ZAxXCAAAQBAJ&pg=PT82&lpg=PT82&dq=joni+mitchell+molested&source=bl&ots=KQQY0MdBeU&sig=SmBb2MFXRL7k8NAMILh5_t6S6mc&hl=en&sa=X&ved=0ahUKEwjcvJySudHZAhXH0FMKHe0fA5IQ6AEIYTAI#v=onepage&q&f=false

Again, the above is just what I've found significant according to my interpretations of the text and I'm not claiming to have read either of these books cover to cover, so feel free to add anything else you find and we'll see where it goes.