I own an 1883 copy of The Story of the Jubilee Singers; it contains their story and a section devoted to their songs. They call them Jubilee Songs; we call them Spirituals, and I have used portions of the rich lyrics.
The foreword of the volume contains significant insight. Fisk University, of Nashville, Tennessee, was established in 1865, fifteen years before the foreword was written. President C. M. Cravath says, “The millions of recently emancipated colored people of the South must be given a Christian education, or the nation must suffer far more in the future than in the past from the curse of slavery.”
These people from Fisk University carried their message in song across the United States, into England, and as far as Germany. I understand the volume has been reproduced, and I heartily recommend it.