In 1975 Queen released Bohemian Rhapsody which was a ground breaking video. This music video was marked the beginning of the music video era and it set the language for visual effects on music videos. This video is actually considered one of the first videos to use advanced visual effects. Official Music videos use the combination of live performances and set performances.
1970: the record industry discovers TV-Shows as a great opportunity to promote their artists.
They focus on producing short "Promos", early music videos which started to replace to live performance of the artist on the Tv-stage.