Monstercat, the Canadian label that is known for innovation, was the first out of the block to embrace Twitch as a major medium for distributing their music. They have an active stream in the "Music" category which is on 24 hours a day that garners anywhere between 700-3,000+ viewers at any given time. OWSLA recently streamed their Christmas party on Twitch while Deadmau5 has been seen streaming on the network a few times in late 2014. Even Steve Aoki had done some promo of his latest album on Twitch while playing Street Fighter for online fans.
The opportunity for major labels and burgeoning music producers alike to start streaming on the service is absolutely huge. In 2013 Twitch brought in 45 million viewers with each user averaging 107 minutes of content viewed a day. I could only imagine that this number has risen higher in 2014.
Seeing Twitch as a major new medium for music is still at its early stages, so if you are a label or music producer (established or not), then I highly suggest that you learn what OBS is and start making your Twitch plans this year.
(VIA Twitch Blog, Lessthan3, onGamers.com)