This document discusses different types and purposes of music videos. It begins by explaining that music videos are typically 3-4 minutes and combine live performance, narrative elements, and visuals to promote the artist and song. There are three main types of music videos: performance videos that feature the artist singing and include concert footage or "behind the scenes" clips; narrative videos that tell a story, either related to or suggested by the song's lyrics; and concept videos where performance and narrative take a backseat to symbolic or thematic visual concepts. The document provides examples and discusses common elements of each type of music video.