It's been awhile since someone's come out of nowhere to shake up country music . . . and isn't that an obvious setup.I'm talking about PRISCILLA BLOCK and her song "Just About Over You". It came out Wednesday and in a minute it debuted at Number One on the iTunes Country chart and is also at the top of the iTunes All-Genre chart.So how did people even know about her?The Internet, of course. Her songs "Thick Thighs" and "PMS" have been racking up hits on TikTok.And it was a little over two weeks ago that she posted a clip of herself in her bedroom doing an a cappella version of "Just About Over You". Fans loved it so much they helped raise money for her to record it as a single.That's the version on iTunes.But don't worry, she's not the next "Walmart yodeling flash-in-the-pan."She's been paying her dues, and she's ready.And thankful. Quote, "I'm absolutely overwhelmed.I've always heard that country music fans are ride or die . . . and this proves it.This is six years of blood, sweat, and tears."