Los Angeles, October 1982: Molimo m'Atet, formerly known as the The Mystic Horn Society, is preparing to release its new album Orphic Bend. The members of the jazz ensemble—Aunt Nancy, Djamilaa, Drennette, Lambert, N., and Penguin—are witness to a strange occurrence: while listening to their test pressing, the moment Aunt Nancy's bass solo begins a balloon emerges from the vinyl, bearing a mysterious message: I dreamt you were gone....

Through letters N. writes to a figure called Angel of Dust, the ever-mutating story unfolds, leaving no musician or listener untouched.

Bass Cathedral is Mackey's fourth volume in his ongoing novel with no beginning or end, From a Broken Bottle Traces of Perfume Still Emanate. Thought balloons morph into mute-stereoptic emanations; N. encounters a master mouthpiece-maker; Drennette leaves Penguin dateless; Lambert's kicking it around with Melanie—much is abuzz but something else is happening to the ensemble. The music seems to be living them. N. suffers cowrie shell attacks and they are all stranded on an Orphic Shore. Socio-political forces are at play or has this always been the essence and accident of the music's resilience? And Hotel Didjeridoo must be resurrected, but how? Myth spins music spins thought spins sex—Mackey's post-bop boxless box set is, as the Utne Reader wrote, "Avant-garde literature you can love: an evolving multivolume novel of the jazz world that plays with language and ideas the way Thelonious Monk plays with flatted fifths."