In the early '80s the idea of a television channel showing nothing but music videos 24 hours a day was completely revolutionary. It posed the first real threat to the dominance of Top 40 Radio across America and went on to completely redefine how artists marketed themselves and the way popular music was consumed by the fans. The arrival of MTV in 1981 quickly led to an explosion in the production of music videos in both Europe and the US, many of which went on to define the decade. From Thriller to Live Aid, Britney to Beyonce; MTV has been the soundtrack to some of the biggest moments in popular culture for the last 40 years.