Rare footage of Jimmie Rodgers doing his famous "blue yodel" on "T for Texas." Rodgers was one of country's first and most enduring stars.

Alt-country progenitors Uncle Tupelo performing their version of the Carter Family standard "No Depression" in 1992.

Johnny Cash performing "I Walk the Line," one of his signature hits recorded for the Sun label.

Here's Bill Monroe playing his bluegrass classic "Blue Moon of Kentucky."

This is just one of Loretta Lynn's classics, "You Ain't Woman Enough to Take My Man."

Here's Waylon Jennings' "Lonesome, On'ry, and Mean."

Patsy Cline did "Crazy" like no one else.