The downside is that people are encouraged to own far more music than they can ever give their full attention to. People will have MP3s of every Miles Davis’ record but never think of hearing any of them twice in a row—there’s just too much to get through. You’re thinking, ‘I’ve got Sketches of Spain and Bitches Brew—let’s zip through those while I’m finishing that e-mail.’ That abundance can push any music into background music, furniture music.