I have used the stock app, and PowerAmp, however there are a couple of features I really miss from iTunes. The first is smart playlists. I don't have time to manually create playlists so I used the smart playlists to do things like 80's Music, and stuff. What app would let me do that? The other feature I used a lot was genius. I pick a song and then the app finds similar songs to play. Any suggestions for an app that does both these things? I have all my music stored on an SD card if that makes a difference. I also listen mostly when I am on the road, or in the subway so I can't use cloud services.