"There may have been some internal politics and it may be my fault for only being in touch with Thom... I'm not sure if when he heard it or heard the shape it was taking whether that was his cup of tea or not. I don't know. He's never really revealed why he pulled out. But that would have been nice." Peter Gabriel on Thom Yorke's decision to pull out of tribute album And I'll Scratch Yours after the veteran rocker covered Radiohead's Street Spirit (Fade Out) on his Scratch My Back project.