We do a lot of cool things with royalty free music at https://www.909music.com/
We are more than just a music library. At 909 Music as a video producer you can post a request for exactly the kind of music you need and get music delivered to you straight in your inbox. If you're registered you'll get relevant music in your dashboard based on the style and mood of the video you are working on, that's how intelligent our algorithm is.
Give it a shot at: https://www.909music.com/