I want to convert audio(song) file into stream or memory stream in windows phone 8

See more:

Windows

audio-video

phone

C#5.0

i am working on wp8 so after doing mess with it i am stuck at converting the song/audio file into stream or memory stream. i need the memory stream because than i will be sending it over my own asp webservice to upload the song file. this is what i have done for fetching songs from wp8 but now i am unable to convert it so that it can be sent over werbservice:

public GetAudio()
{
    fetchFromPhone();
}

private void fetchFromPhone()
{
    MediaLibrary med = new MediaLibrary();
    SongCollection allAlbums = med.Songs;
    foreach (Song item in allAlbums)
    {
        var stream = item;
        string arr = Convert.ToString( stream);
        byte[] by=Convert.FromBase64String(arr);
        MemoryStream ms= new MemoryStream (by);
        // i am unable to get stream..
        // what to do here next to send it over service

     }

}

Or suggest me some better way to achieve this. thanks in advance.