Different sound outputs
The streamer has the ability to chose on twitch a different way to output the music lets say you connect the spotify playlist on twitch and have the ability to let the watcher chose if he wants to mute the sound and hear the streamer or he wants to hear everything.
If you dont want to hear the music than mute it seperatly and enjoy the stream.
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LadyPotaty
commented
I don't even think this would be difficult to implement. Twitch's VODs already automatically silence secondary audio streams, these could be exposed to the UI like the master slider already is.
This would also make it so the 3 unused audio channels actually have a use. The standard could be Channel 1 is game, 2 is mic, 3 is music, 4 is alerts, 5 is misc. And for simplicity, the master slider could just control all channels.