Soundtrack by Twitch provides streamers on the platform with a library of rights-cleared tracks to integrate with streaming software to separate audio sources, allowing streamers to keep their channel safe as a content creator without worrying about your archives being muted or receiving strikes against your Twitch channel.
Soundtrack’s expansive collection of songs from artists are all cleared for worldwide listening during live streams and contains a diverse library of artists and genres to stream!
There are no royalties associated with this service, and deliveries are bundled with the partner, Amazon. If you deliver to Amazon, it will automatically be included in Soundtrack by Twitch.
You can find more details about this service in Twitch's FAQ.