This document discusses key codes and conventions used in music videos. It explains that music videos are designed to sell albums and can be performance, narrative, or concept-based. Genres like pop music often feature dance routines while metal videos show extravagant performances. Lyrics and visuals in videos may be related through illustration, amplification, cutting to the beat, repetition, or close-ups of the singer. Labels aim to connect videos to albums through artwork and imagery. Videos also reference other works through techniques like screens within screens or allusions to films.