AMID frothing fountains of praise for the purest of American country voices – “even her outtakes, her mistakes, are better than most people could ever dream of,” effuses country boy Brad Paisley – one songwriting demigod goes to the heart of Alison Krauss’s appeal.

“Her delivery is so cool, so detached and so technical, it’s like hot chocolate on vanilla ice cream,” reckons James Taylor, whose union with Krauss on How’s The World Treating You is every entwined moment a rival to her Raising Sands album with Robert Plant.

This immaculately tasteful DVD has Krauss and her regular Union Station guys going the extra mile with gilded guests on songs from her latest album, their eyes often closed in rapture. It is all so perfect, just sometimes you crave a change of flavour, something crunchier.