Review: Samsung Galaxy Prevail
The Prevail uses the stock Android music player application. It offers basic library organization. If you want to add music to the microSD card, you have several options: 1. Pull out the card, stick it in your PC and drag-and-drop files directly onto the card; 2. Connect the Prevail via USB and choose "USB Mode" when the Prevail connects to the PC; 3. Use third-party software such as doubleTwist (separate download). Once your media is loaded, you're good to go.
The stock media player 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. It goes without saying that the music player has a widget for the home screen, as well.