Iconic for its use of pencil-sketch animation blended with live-action footage, A-Ha's music video for "Take On Me" just reached a new milestone. On Monday night, the song officially streamed its one billionth view on YouTube. According to Billboard, that's a rarity for pre-1990s tracks and a first for a continental European act. Originally released in 1984, the single didn't go far. So they put it out again with the Steve Barron-directed video we know, which launched it to No. 1 in 36 territories, leading the Norwegian electro-pop trio to sell more than 55 million albums over their career. Which are some other iconic music videos? Which have been some of your favorites?