The Musical Robot Fandroid!
He is a youtuber who has made songs such as:
The Devils Swing (BatIM)
The Old Song (BatIM Chapter 2)
Curiosity (Got the best of me) (Hello Neighbor)
Don't Tattle on Me (Tattletail)
City of Life (Zootopia :3)
Hard in the Paint (Splatoon)
And many more I can't remember!