The video shows a person writing on a piece of music paper with a marker. The person writes the words "One IT" and "Secondary Dominant" on the paper. The person then writes a series of notes on the paper, including a major chord and a secondary dominant chord. The person's hand is visible in the video, and they are using a black marker to write on the paper. The music paper has five horizontal lines, and the person writes on the top line. The video is shot from a top-down perspective, and the person's hand is the only part of them that is visible.