Cutting to the beat in a music video refers to changing shots or cutting between different camera angles in time with the beat of the song. The document provides instructions for an activity where students will analyze Adele's "Rolling in the Deep" music video by highlighting lyrics where the shot changes and identifying different shot types. They will then discuss how cutting the shots to match the beat enhances the music video by closely linking the visuals and audio. The effect of cutting on the beat is that it synchronizes the images with the music, bringing the viewer out of the dark through a rising fire and fever pitch.