Winamp - is a downloadable application to play music and is not generally meant for the web. However, shoutcast allows you to stream content (shoutcast.com); again however, this is a system application which can be queried using a web-service, query or etc directly from shoutcast so you can provide a link, album listing and etc.
Though, none of this is what you asked; as your question is not answerable as Winamp is not currently a Web Application.
That's not a skin, it's some god awful piece of skinner gunk. - Mr. Jones