https://www.pcgamer.com/livestream-karaoke-game-twitch-sings-is-out-now/

Twitch Sings, the first game developed in part by Twitch, is out now. 

It's a free livestream karaoke game co-developed by Rock Band and Guitar Hero studio Harmonix Music Systems. It has nearly 2,000 songs to choose from, and they're all "in the style of" cover versions rather than the original tracks. The game analyses how well you're hitting notes, rewarding you with loads of XP for a pitch-perfect performance.