While flipping through a five-year-old copy of NME in a WFMU bathroom, I came across an article about "scary music" by Mark Beaumont. He wrote that the little kids who can be heard wailing on Lou Reed's track The Kids (from his 1973 LP Berlin) were the young children of producer Bob Ezrin, who were crying because their Dad had told them that their mother had just been killed in a horrible accident. Their mother was fine - the track needed some crying, so Producer Ezrin produced some. The crying starts at the 5:17 mark: MP3.
A few years later, Ezrin went on to co-produce Pink Floyd's The Wall, on which he utilized another group of children to great effect, the chorus of British children from The Islington Green School who sing the "We Dont Need No Education" chorus on Another Brick In The Wall (Part 2). In 2004, 23 of those kids got together to sue for the session fee they never received. No word on whether Ezrin's own children (now around 40 years old) are planning their own suit.
"shock" photo by Jill Greenberg