"It is useful," Autor says, squeezing his friend's shoulder. "Very much so. I've picked up players loaded with music from the Bar with no issue. I'm sure you can make up a similar stereo system for your lab and hook those up to it. There are also these round disc things called CDs if you haven't heard of those."

He cups his hands to show the size of one. "All the music of all the multiverse is available to us here. Think of it, Joly--music from every planet that ever existed. Some of which we wouldn't even identify as music, I suspect!"