Music snobs have always been famously opposed to the ever-increasing daily load of aural clutter in the modern world, preferring silence to background music, and talking in lofty tones of how all this focus on “multitasking” is really just an excuse not to listen deeply. But at least one expert says that our growing ability to focus while shutting out any number of layers of clutter is a sign that all the disruptions are good for our brains.