https://www.pcgamer.com/twitch-sings-is-a-livestream-karaoke-game-set-to-begin-beta-testing-later-this-year/

Twitch announced a new feature today at its convention: Twitch Sings, a community karaoke game that's going into closed beta soon. 

"Built from the ground up for live streaming, [Twitch Sings] has hundreds of songs and features that streamers and their communities can use to make amazing, one-of-a-kind performances together," Twitch said. "In chat, viewers can request songs, cheer to activate light shows on stage, and give their favorite streamers challenges to tackle."