Playing Music On Stream
Allow creators to play music on stream even if not created by the user or having rights to it but are required to keep it a very low volume. I feel removing the ability for streamer to have background music of their, or viewers choice is taking away the personality of the streamer. For me the music I listen to describes the person I am the mood I am feeling and an over all setting for new and old viewers.I just don't want to have to play a game and not listen to my favorite songs as I hang out with friends and viewers.

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BoomLiam commented
This is not a matter of Twitch's rules/policy - this is a matter of law. I'd recommend reading up on DMCA law on Google, or reading through this AMA reddit thread on /r/Twitch last week: https://www.reddit.com/r/Twitch/comments/gzr8jp/lawyer_here_put_together_a_summary_of_some_basics/