C#简单的Linq-to-XML查询只返回1个结果

我有一个处理简单xml的项目。但是我的LINQ查询不能正常工作。如果你能帮我的话。我有点困了。我有类似的项目正在顺利进行。下面是我处理C#的代码

void RecordsDownloaded(object sender, DownloadStringCompletedEventArgs e)
    {
        if (e.Result == null || e.Error != null)
        {
            MessageBox.Show("There was an error downloading the XML-file!");
        }
        else
        {
            XElement xml = XElement.Parse(e.Result);
            String bandKey = bandID.Text;
            IEnumerable<XElement> musicXml = xml.Elements("band");
            Boolean foundRecords = false;
            foreach (XElement band in musicXml)
            {
                if (band.Attribute("bandID").Value == bandKey)
                {
                    ResultsListBox.ItemsSource = from song in band.Descendants("songs").Descendants("song")
                                                 select new Song
                                                 {
                                                     Name = song.Attribute("name").Value,
                                                     Sum = song.Attribute("sum").Value,
                                                     Number = song.Attribute("number").Value
                                                 };
                    foundRecords = true;
                    break;
                }
                else
                {
                    foundRecords = false;
                }
            }
            if (foundRecords)
            {
                if (ResultsListBox.Items.Count > 0)
                {
                    MessageBox.Show("Music Band songs Record(s) Found!" + ResultsListBox.Items.Count);
                }
            }
            else
            {
                MessageBox.Show("You do not have any Movie Session!");
                ResultsListBox.ItemsSource = null;
            }

        }
    }

和我的xaml代码

<ListBox Background="Black"  Height="472" HorizontalAlignment="Left" Margin="0,148,0,0" Name="ResultsListBox" VerticalAlignment="Top" Width="480" SelectionChanged="ResultsListBox_SelectionChanged">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal" Height="120">
                        <StackPanel Width="350">
                            <TextBlock Text="{Binding Name}" TextWrapping="Wrap" FontSize="20" />
                            <TextBlock Text="{Binding Sum}" TextWrapping="Wrap" FontSize="16" />
                            <TextBlock Text="{Binding Number}" TextWrapping="Wrap" FontSize="16" />
                        </StackPanel>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

我的班级代码

namespace MusicRateMobile
{
public class Song
{
    public String Name { get; set; }
    public String Sum { get; set; }
    public String Number { get; set; }
}
}

和我的xml代码

<music>
 <band bandID="1" name="Gorillaz">
  <songs>
   <song name="Feel Good" sum="4" number="1">
   </song>
  </songs>
 </band>
 <band bandID="2" name="Eminem">
  <songs>
   <song name="Mockingbird" sum="4" number="1"/>
   <song name="Slimshaddy" sum="4" number="1"/>
  </songs>
 </band>
</music>

ResultsListBox.ItemsSource = from song in band.Descendants("song")
                             select new Song {
                                              Name = song.Attribute("name").Value,
                                              Sum = song.Attribute("sum").Value,
                                              Number = song.Attribute("number").Value
                                             };