As HtmlAgilityPack is yet not supported in windows phone 8.1,referencing manually in the project was a trick solution. But this is not the only problem. I could use XP
You can do it using the Element/s method:
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(htmlString);
var h6Nodes = from h6element in doc.DocumentNode.Element("body").Element("center").Elements("h6")
where h6element.Attributes["class"].Value.Equals("songs-list")
select h6element;
This is assuming you have something like
string htmlString = @"
Hello
World!
Insert that one song here
"
and that will get the node with class songs-list.