“It’s my most precious possession,” Max Ochs says as he retrieves a piece of broken metal from a guitar case — a scrap of trash he found on a dirt road in New Mexico in 1967 that he’s been toting around as a guitar slide for more than half a century. “The old cars were heavy, and they needed a really substantial car jack, and this piece had just broken off so beautifully,” he says, half smiling, fully aware that he’s holding his life’s essence in his palm.