The contrast of his voice with the mellow baritone of Country Gentleman guitarist Charlie Waller created a rich blend without precedence in bluegrass .
The son of a singer at the Metropolitan Opera , Duffey possessed a soaring range that shifted almost without notice from tenor to falsetto .
The contrast of Duffey 's voice with the mellow baritone of Country Gentleman guitarist Charlie Waller created a rich blend without precedence in bluegrass .
The son of a singer at the Metropolitan Opera , Duffey possessed a soaring range that shifted almost without notice from tenor to falsetto .