Many people are perfectly happy playing music from their smartphones. They don't mind interruptions caused by calls, reminders, and app notifications. Maybe listening to music doesn't mean so much to them that it would make them feel bad. Then there are those who find it annoying. They don't want any kind of interruption while their eardrums are being caressed by music, as it is a special pleasure for them. And this is where Sony's new "walkman" comes into play.