Did you use
http://64.62.252.134:5100 as the URL for BellyUp4Blues? That's what you actually need to be providing, not the URL for the Winamp or Windows Media files.
To get the URL for the actual stream, right-click on the "Listen" link and save the target as a local file. Then open that file in a text editor (like Notepad) and find the link there.