Double Trio: Tej Bet, So's Notice, Nerve ChurchFor thirty five years American poet Nathaniel Mackey has been writing a long poem of fugitive making like no other: two elegiac, intertwined serial poems "Song of the Andoumboulou" and "Mu" that follow a mysterious, migrant "we" through the rhythms and currents of the world with lyrical virtuosity and impassioned expectancy. In a note to this astonishing box set of new work, Mackey writes: "I turned sixty five within a couple of months of beginning to