Mark, My Words: Is it possible to write a genuinely original song?

"With well over five million tracks released in the past 60-odd years of rock ‘n’ roll – and with rap and Britpop making ‘sampling’ from the past a legitimate artistic endeavour – it’s almost impossible to come up with something that has no similarity whatsoever to anything that’s gone before" - Mark Beaumont asks in his Mark My Words segment.