She is currently breaking sales records -   this doesn't make her music significant, but it mnakes *her* significant for those of us who like to reflect upon the cultural/historical/social aspects of music.

I've never criticised those Mudcatters who want to wrangle over the chord sequences on a particular banjo to some old fart's version of 'Froggy Went A Courting' - that's your thing & good luck. But others here, me included, like to look at music's impact as well as its content.