I’m no audiophile, but I have to say the sound I get streaming Spotify via the mobile app in my car is so much better than that of the mp3′s on my ipod I have stopped purchasing music altogether and upgraded my Spotify membership to premium. It’s that much of a difference. There may be mitigating reasons for this, but most of my mp3s are sourced from itunes, emusic, amazon or rips from cd’s.