Mail from Twitch:
"Until May of this year, streamers received fewer than 50 music-related DMCA notifications each year. Beginning in May, however, major record labels started sending thousands of DMCA notifications each week."
"This means two things:
1) if you play recorded music on your stream, you need to stop doing that.
2) if you haven’t already, you should review your historical VODs and Clips that may have music in them and delete any archives that might."