DoubleTwist is decent in getting your music moved from a pc or mac to your phone, if that's what you need. It was one of the few that also transferred your playlists from iTunes to a Samsung device (Samsung has always had some weirdness in how it sets up your music and playlists) Double Twist also has a pretty decent music player once you get your music transferred. But I will admit that sometimes it feels like you have to stage the equivalent of an Italian Opera to get the job done. I have never been able to get comfortable with Google Music.