I am looking for a music play for when I am in the car. I have my X plugged into my aux input and would like a player that will leave the screen on so I can see the song playing and have access to the pause, back, and forward buttons without having to unlock the screen everytime. I know the car dock can do this, buy I can't use playlists with it. It will be plugged into the charger so I'm not worried about running the battery dead. I can do this with Pandora and want some thing like it so I can play the music on my SD card. Thanks for any help.