http://www.bbc.co.uk/news/magazine-18449107 Why are the Beatles so popular 50 years on? Why are the Beatles so popular 50 years on? Adam Gopnik explain en el diario de la BBC The Cassette Gandhi what keeps a mere 7-year career alive for 50 years The Fab Four's music Why are the Beatles so popular 50 years on? BBC News Magazine The Cassette Gandhi http://www.bbc.co.uk/news/magazine-18449107 essay for the BBC by that fine commentator, Adam Gopnik,