May 08, 2012 Rebecca Black's 'Sing It' Official Music Video. It's been a while since Rebecca Black dropped her third single "Person of Interest", but the former YouTube sensation is now back with a fresh track. She releases a song called "Sing It" and premieres a music video to help promote it. This Rebecca Black's 'Sing It' video is made only to promote the artist. Content is copyrighted and property to their respective owners!. Write a comment, show you thanks and love for Rebecca Black's 'Sing It' and don't forget to buy their single / album!!.