Purpose of a Music Promo video

The main purpose for a music video or promo video is to advertise the band and their song. New and upcoming bands will make music videos to help them get more fans. Existing bands will make music videos to advertise and get more popularity from people who are not fans of the band and to try and persuade them to become fans. By doing this the bands popularity is increased which will then increase the bands income from music sales and tour sales. These are the main purposes of music/promo videos.