Examine the history of bluegrass music, from its origins to its eventual worldwide popularity, and hear from dozens of musicians who explain the ways bluegrass music transcends generational, cultural and geographic boundaries.

The story of Bobby and Sonny Osborne, better known as The Osborne Brothers, one of the most successful bluegrass groups of all time. Born in Hyden, Kentucky, they achieved world wide recognition with their 1967 single, “Rocky Top.”