<!--LayoutRoot is the root grid where all page content is placed-->

    <Grid x:Name="LayoutRoot" Background="Transparent">

        <Grid.RowDefinitions>

            <RowDefinition Height="Auto"/>

            <RowDefinition Height="*"/>

        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->

        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">

            <TextBlock x:Name="ApplicationTitle" Text="My Application" Style="{StaticResource PhoneTextNormalStyle}"/>

            <TextBlock x:Name="PageTitle" Text="MediaElement Demo" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>

        </StackPanel>

        <!--ContentPanel - place additional content here-->

        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">

            <MediaElement Height="433" HorizontalAlignment="Left" Margin="12,0,0,140" Name="mdElementDemo" VerticalAlignment="Bottom" Width="438" />

        </Grid>

    </Grid>

using System;

using System.Windows;

using Microsoft.Phone.Controls;

using Microsoft.Phone.Tasks;

namespace MediaElementDemo

{

    public partial class MainPage : PhoneApplicationPage

    {

        // Constructor

        public MainPage()

        {

            InitializeComponent();

            this.Loaded += new RoutedEventHandler(MainPage_Loaded);

        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)

        {

            MediaPlayerLauncher launcher = new MediaPlayerLauncher();

            launcher.Media = new Uri("http://www.robtowns.com/music/blind_willie.mp3", UriKind.RelativeOrAbsolute);

            launcher.Controls = MediaPlaybackControls.All;

            launcher.Show();

        }

    }

}