Review: LG Marquee for Sprint
Music
The Marquee uses the stock Android media player. It's bare bones, but it gets 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. It goes without saying that the music player has a decent widget for the home screen, as well.
There are no third-party music applications pre-installed, such as Slacker or Pandora, though they are easy to find in the Android Market.
Video
The Marquee has minimal video play-back features. Only the stock Android YouTube player is on board out of the box. I found that the Marquee handled side-loaded content (movies that I placed on the microSD card) just fine, though it plays that content back via the photo gallery application.
There's no way to purchase or rent video content directly from the Marquee. This thing doesn't even have Sprint TV or NASCAR.