I used to stream a while ago, and i used music but not using the new feature. It was some kind of library where you put YouTube video links, and that was the music i played. And users could type !currentsong to see what music was playing. Does anyone know how to do it?
You’re most likely thinking of one of the channel bots and their respective websites.
Examples would be:
https://beta.nightbot.tv/
Or the similar feature over at http://twitch.moobot.tv/
This forum is for third party developers who are building integrations with Twitch. You’ll likely have a better response on r/twitch on reddit.