If you're a user of butt ("broadcast using this tool"), you can add song metadata to your butt stream with the help of Streamling.

1. Make sure Streamling Overlay app is running
2. In butt, go to settings > stream > Update song name from file: 
   • %UserProfile%/Documents/streamling/livetext/nowplaying-minimal.txt
3. (Also in butt): Make sure the "Activate" checkbox is checked.
4. That's it, you're done. Butt will now receive the current artist and song title of whatever music you're playing in any music player supported by Streamling Overlay while both are running.

You can alternatively choose the filenowplaying-minimal-ascii7.txt(which is found in the same directory) if you want artists and song titles to use only the basic US-ASCII characters. Diacritics will be removed; Any Unicode character that can't be represented will be replaced with "?". I recommend you just use nowplaying-minimal.txt though which contains Unicode and is supported by butt.

You can also adjust other settings, such as "Update song name delay" or "Extend song name" if you want to. You don't need to copy those settings from the screenshot.

Note: Unlike other setup instructions, these are to setup sending metadata to butt, not the other way around. I guess you worked that out by now. Though Streamling has a built-in Icecast server which butt can connect to, Streamling cannot receive metadata from butt so there's little reason to connect to it. Maybe it's useful for testing. But testing what? I don't know. It was useful for quickly making a screenshot of butt in use I guess. Instructions for setting up Streamling's Icecast server are in the Traktor setup instructions, by the way, which, again, are not useful for butt. Anyway, enjoy your broadcast, butt user.

Screenshot of Butt with "Update song name from file" set to: %UserProfile%/Documents/streamling/livetext/nowplaying-minimal.txt