The Cox Family's "God Dips His Pen of Love in My Heart" from Bluegrass Underground 

Taped 333-feet below ground within Tennessee’s majestic Cumberland Caverns, this 12-part “musical adventure” series features both well-established and top emerging artists within the broad spectrum of Bluegrass, Jamgrass, Roots-Rock, Neo-Folk and Americana genres.
One of the finest vocal trios in Bluegrass and Trad-Country ever to call the state of Louisiana home, Suzanne, Evelyn and Sidney Cox returned to the national music scene a few months ago with their first album in almost 20 years, the critically-acclaimed Gone Like the Cotton. Mentored by Alison Kraus, the Grammy-winning Cox Family’s refined-yet-broad appeal has earned such diverse career milestones as opening tours for Counting Crows and contributing several songs to the GRAMMY and Oscar-winning O Brother, Where Art Thou? film/soundtrack, the best-selling roots music album of all time.
Check out other Bluegrass Underground (PBS) Season Six artists including Dave Rawlings Machine, The Suffers, Frank Solivan & Dirty Kitchen, Hurray for the Riff Raff, Mac McAnally, JJ Grey & Mofro, The Lone Bellow, Drivin’ and Cryin’, Sierra Hull, St. Paul & the Broken Bones, and Jason & The Scorchers.