GATHER AT THE RIVER points Mugge's cameras (and his sharply recorded sound) at the ongoing evolution of bluegrass, the 'high lonesome' music that is celebrated each year at the World of Bluegrass Festival in Owensboro, Ky. The 1993 event constitutes the entirety of Mugge's film, a generous feast of performance by the finest bluegrass musicians, punctuated by authoritative commentary about the past, present and future of bluegrass music… Pure magic.