I use a separate music player just because I like non-singular points of failure.<p>The idea of carrying a single object that is your means of communication &#x2F; music player &#x2F; camera &#x2F; train ticket &#x2F; monetary instrument &#x2F; entertainment center is <i>neat</i>, until you think about your battery dying &#x2F; losing it &#x2F; dropping it and having it crack in half when you&#x27;re a hundred miles from home.<p>I guess it is less bad if you tend to travel in packs, and would always have a backup in that way.