Tyehimba Jess’s 2016 Olio is mammoth. Comprised of letters, interviews, sketches, architectural and mathematical poems, "Jubilees," songs, conversations, and formal poems, and accompanied by a playlist of musicians, Jess’s second offering introduces us to (reminds us of) thirteen "first-generation-freed voices" plus the Fisk Jubilee Singers, all of whom "coalesce in counterpoint, name nemeses, summon tongue …