In Bass Cathedral, the fourth installment of Nathaniel Mackey’s epistolary novel From a Broken Bottle Traces of Perfume Still Emanate, the author plots language’s intimate relationship with music, the point where sound and sense meet. N., the series’s reedman and trumpeter, continues to chronicle the musical, intellectual, sexual, and supernatural exploits of the jazz group Djband (né the Molimo m’Atet, the Mystic Horn Society, and the East Bay Dread Ensemble, among others) in his letters to a correspondent known as the Angel of Dust. This volume finds the band in the wake of their first record