Twitch Music Label
Music is integral to the social-experience. It creates an ambience for an intimate setting, helps the tone of the stream take form to more consistently help people fit in with a streamers' chat, and helps promote artsists.
With that in mind, and MANY channels dedicated to music on your platform, you could, realistically, call upon creators to send in submissions for music they created with legally purchased licenses. Since established labels won't let music be enjoyed, make your own.
Other places with such content creation are Bandcamp and Soundcloud, both of which would fall head-over-heels if they could partner with yall to help make things both smoother and easier as you attempt to begin this. You've a lot of people fiending for music in a time that is EXTREMELY HORRIBLE for artists due to Covid. This would be great public relations, improve the community, and you'll probably create stars by boosting them through such a service.
Being a streaming platform, you could also work in live-streams of concerts/accustic-sets/etc. You could even setup lists of artists for hire - people willing to make a tune for a channel, intro to videos they upload elsewhere, etc. Make the expansion to your brand, request applicants, setup terms of submissions (clean-lyrics, lack of vulgarity, etc - it's up to you to say what will be acceptable or not).
But with tens of thousands of potential applicants (honestly a couple hundred-thousand if marketed well), how the **** will you sift through them, right? You could attempt to program a bot - but, that's too much work for something that will probably result in failure. You could, and should, be hiring people for this based on categories. You could even have users go in and vote, and so long as they didn't obviously troll-pick, it should be fine and make things easier for people to sift through. You could show how many times a song has been tried, and not show the approval rating. Builds suspense, and doesn't contribute to the choice one may make when you also advertise "There are lots of tunes to listen to. You gunna listen to them all? See that low-count? Might've found a gem" or something like that example.