The document provides a timeline of the evolution of music videos from the 1920s to 2013. Some of the key events mentioned include the first use of animated bouncing balls in music videos in the 1930s, Oskar Fischinger creating animated films with "visual music" in the 1920s, the Beatles starring in feature films to promote their albums in the 1960s, David Bowie expanding the freedom of costume in music videos in the 1970s, and the terms "music video" and "VH1" emerging in the 1980s as the genre became more established.