This response uses data provided by Google's Knowledge Graph TheFatRat - Unity - Newgrounds.com

TheFatRat often provides his music royalty-free. You can find official high-quality downloads on Newgrounds or through his official YouTube description , which often links to direct file hosts like Box or his personal website. Streaming: Available on Amazon Music and SoundCloud. 2. Alan Walker – Unity

A collaborative track released for his fans (the "Walkers").