For over forty years, John Cowan has been both a participant in and chronicler of country and bluegrass music history. Whether as the lead singer and bassist of the genre-bending group New Grass Revival, a beloved personality on Nashville's WSM radio ("the most famed country music station in the world"), or the newest member of the Doobie Brothers, Cowan has had a front-row seat to seismic changes in American roots music and in the recording industry...