The document discusses the purposes of music videos. It explains that music videos help promote songs and artists, extending their income through increased sales and views on platforms like YouTube. Music videos also provide more outlets to access and enjoy songs on television and online. They can create synergies when used in conjunction with films to promote both the artist and movie. Different music video producers, like major labels, independent producers, and self-produced artists, have varying strategies for promoting songs through music videos based on their budgets and goals.