It's an old show I watched when I was young, but I don't remember if at the time it was new or not, so it's at least 15~20 old but might be older.
It follows a young robot boy who goes on adventures. He's a fan of another celebrated robot, the size of a Gundam, but doesn't realize the other bot is in fact a Mech-suit. There's is a hero sidekick type relationship between the robot boy and the pilot/mech.
He makes short videos covering famous songs with both instruments and random items. I'm fairly certain he is bald and usually memes a bit with his sunglasses.
I just can't find me guy and this itch is getting annoying.