If you wish to understand the enduring legacy of Mariah Carey’s “All I Want For Christmas Is You” – the song which, 30 years on, has cemented the singer as the undisputed Queen of Christmas, then look ...

That's not to suggest that "Old Town Road" and "A Bar Song" are the two biggest hits of all time. They're merely beneficiaries of a streaming landscape in which listeners are continually fed the same ...