Music videos serve three main purposes: 1) promotional purposes by marketing and selling music recordings, 2) extending income through additional outlets like music channels and downloads, and 3) allowing producers to employ strategies to promote major label and independent artists. Historically, modern music videos originated in the 1950s as promotional devices for songs and expanded in the 1970s with the rise of shows like Top of the Pops that helped boost single sales. Today, a music video is typically created for every charting song to help promote the song through visuals and popularity.