XML Deserialization Issue with different XMLRoot Name

De-Serializing Class

[XmlRoot(ElementName = "sgr")]
public class SongGroup
{
    public SongGroup()
    {
        this.Songs = new List<Song>();
    }
    [XmlElement(ElementName = "sgs")]
    public List<Song> Songs { get; set; }
}

[XmlRoot(ElementName = "g")]
public class Song
{
    [XmlElement("a")]
    public string Artist { get; set; }
    [XmlElement("s")]
    public string SongTitle { get; set; }
} 

C# Code

static void Main(string[] args)
    {
        SongGroup songs = new SongGroup();
        for(int i =0; i<5;i++)
        {
            Song song = new Song();
            song.Artist = "Artist " + i;
            song.SongTitle = "Title " + i;

            songs.Songs.Add(song);
        }
        SaveSongs(songs);
    }

    public static bool SaveSongs(SongGroup songs)
    {
        XmlSerializer serializer = new XmlSerializer(typeof(SongGroup));
        using (TextWriter textWriter = new StreamWriter("mysongxml.xml"))
        {
            serializer.Serialize(textWriter, songs);
        }
        //var xDocument = XDocument.Load("mysongxml2.xml"); // need to it working

        var xDocument = XDocument.Load("mysongxml.xml"); //works fine

        string xmlString = xDocument.ToString();

        var serializer2 = new XmlSerializer(typeof(SongGroup));
        var reader = new StringReader(xmlString);
        var instance = (SongGroup)serializer2.Deserialize(reader);
        return true;
    }

mysongxml.xml

<?xml version="1.0" encoding="utf-8"?>
<sgr xmlns:xsi="http://ift.tt/ra1lAU" xmlns:xsd="http://ift.tt/tphNwY">
  <sgs>
    <a>Artist 0</a>
    <s>Title 0</s>
  </sgs>
  <sgs>
    <a>Artist 1</a>
    <s>Title 1</s>
  </sgs>
  <sgs>
    <a>Artist 2</a>
    <s>Title 2</s>
  </sgs>
  <sgs>
    <a>Artist 3</a>
    <s>Title 3</s>
  </sgs>
  <sgs>
    <a>Artist 4</a>
    <s>Title 4</s>
  </sgs>
</sgr>

mysongxml2.xml

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfSong xmlns:xsi="http://ift.tt/ra1lAU" xmlns:xsd="http://ift.tt/tphNwY">
  <Song>
    <Artist>Artist 0</Artist>
    <SongTitle>Title 0</SongTitle>
  </Song>
  <Song>
    <Artist>Artist 1</Artist>
    <SongTitle>Title 1</SongTitle>
  </Song>
  <Song>
    <Artist>Artist 2</Artist>
    <SongTitle>Title 2</SongTitle>
  </Song>
  <Song>
    <Artist>Artist 3</Artist>
    <SongTitle>Title 3</SongTitle>
  </Song>
  <Song>
    <Artist>Artist 4</Artist>
    <SongTitle>Title 4</SongTitle>
  </Song>
</ArrayOfSong>

My problem is that when the root name is sgr everything works fine but I need the same to get working with ArrayOfSong as well.

Thanks,