Music videos originated as promotional videos ("promos") for bands to sell more records. As MTV launched in 1981 exclusively playing music videos, the format became a new form of visual entertainment. MTV helped expose alternative music genres to wider audiences through music videos. Analyses of music videos by Billy Talent and Nirvana for their songs "Rusted from the Rain" and "Heart Shaped Box" show how these alternative rock videos utilize cinematography, editing techniques, and visuals that parallel the songs' lyrics and sounds to represent the genre.