It may open up with Aaron Neville's 1993 rendition of George Jones' classic "The Grand Tour," but Ace's 2012 compilation Behind Closed Doors: Where Country Meets Soul focuses on the golden age of country soul – the late '60s and early '70s, the age when the borders between these two strands of southern American music became decidedly blurring. And many of the 23 cuts on Behind Closed Doors are firmly within the Southern soul tradition – slow, smoky, gritty, and soulful, anchored by languid stride piano and buttressed by muscular horns.