Rebecca Black is a pop singer who became infamous on YouTube for singing "Friday", which has been regarded as the worst song of all tme.
Rebecca made a cameo in the episode, Back in Black. When Metal took over the company after Indie is concentrating more on his needs, Metal discovers Indie hired her to write songs about the lunch he ate that day because he stated it would be ironic.
As a result of Metal taking over in order to save money, he fires her. In response, she angrily tells him that she's not fired, but she quits.
In both episodes of Kids React, Athena Stamakinley and Lia Marie Johnson reacted to two of Rebecca Black's music videos: "Friday" and "My Moment".
In the first episode of MyMusic Presents, David Choi chooses Rebecca Black as the next artist that he plans on working with after CLARA.