Call it alt-country, call it Americana, call it whatever you like—as long as it's got one foot in bluesy chords and another in body-moving rhythm and blues, you'll find it here. Roots rock stretches through the decades: It's in the psychedelic folk of the Grateful Dead and elegant twang of The Band in the ‘60s; the wiry minimalism of J.J. Cale and full-throated choruses of Little Feat in the '70s; the classic songwriting of Tom Petty and earnest hitmaking of Counting Crows in the '90s; the of-the-moment Southern drama of Drive-By Truckers and postmodern smarts of Wilco.