Most bands and artists stride along modestly thoughout their careers, being consistently brilliant but never really bothering the mainstream. Others have a flicker of fame and then fade into obscurity. Then there are some that have Eureka moments and completely explode - these are the turning points of those brilliant acts that suddenly become absolute huge.
Remember when Muse were just three weirdos from Devon? They still are, but now they're the supermassive. There was also a time when Biffy were just hairy lads destroying toilet venues and a time when 'Lana Del Rey' didn't even exist. But something happened where everything changed.
Here are 15 epic turning points in the careers of today's biggest and best artists.