How Coldplay, a band that says rock is 'done', grossed $500 million

Coldplay, the immensely popular rock band led by Chris Martin, grossed over $500 million on its last tour, 'A Head Full of Dreams', and has an Amazon Prime concert movie coming out Friday. Its success in an era of dwindling album sales and declining interest in male-fronted rock bands is a testament to Coldplay's collaborative art. But it may not last as a business model for rock.