Review: Samsung DoubleTime for AT&T
The DoubleTime uses the old, stock Android media player. It is bare bones, but it does get the job done. You can sort through your playlists, artists, albums, and songs easily enough, and album art comes through properly when tagged to the music. The media player can be sent to the background while you do other things such as browse the web or check Twitter.
There are no third-party music applications pre-installed, though they are easy to find in the Android Market.
The DoubleTime has minimal video play back features. Only the stock Android YouTube player is on board out of the box. Videos captured by the DT or sideloaded are played back in the Gallery app.