Along with a classical-music world that has historically shunned African American composers and performers, Horowitz sees a falsely held American 'pastlessness' that ignores the depth and breadth of the 'sorrow songs' of America’s slaves, a pastlessness that, internalized even by the likes of Virgil Thomson, Aaron Copland, and Leonard Bernstein, has deprived the musical world of a truly vernacular American classical music. It’s certainly a provocative claim, and Horowitz’s narrative, informed as it is, isn’t the easiest to track. Still, the full manifestation of Dvořák’s vision is thrilling to consider..