A silent video will always feel weird. As mentioned earlier, copyrighted music is a no-no. You can get banned if Twitch detects you're playing illegal music if you know what that means.
You can use Nightbot or Spottybot to add music to your Twitch stream. Since Spottybot is only available in certain countries, this article will focus on adding music with Nightbot. You can refer to an application that is Twitch that can download the latest videos at https://twitchclipdownloader.online/