Inside a lab at the Vanderbilt Kennedy Center, Reyna Gordon is holding up a tangle of elastic wires connected to electrodes. “For the kids, we call it a spaghetti hat,” she says with a laugh. Gordon, a music cognition researcher, fits the spaghetti hat over my head like a shower cap. The electrodes touch dozens of points on my skull. This is how she looks at my brain waves, she explains.