5. Sex Pistols
We all know that if the punk rock legends ever reformed again (without Sid Vicious, of course), the resulting concert would stink of anarchy and drugs... but that's how it was in the 1970s, so why change things now? Johnny Rotten and company have reunited a whopping five times - four of them in the last eleven years - but they are yet another band that will undoubtedly sell a load of tickets and will always have a massive following, despite not being everybody's cup of tea. However, we suggest they wait a while or it will just get old too soon.