When Jimmie Rodgers, the “Father of Country Music,” cut “Blue Yodel #9” with Louis Armstrong in 1930, combining rural mountain music with blues and jazz was a great idea.

When Bob Wills expanded on it a few years later, it still was. Servant of Love is the latest iteration of this impulse. Yet at core, it is simply American roots music, which is what Patty Griffin’s art has always been about.

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Rolling Stone