George E. Webb wrote this thesis while completing his Master of Church Music degree at the Southern Baptist Theological Seminary. In it, he examines William Caldwell's Union Harmony hymn book, which was originally published in 1837. Webb aims to answer six questions: (1) What was the purpose of this collection? (2) What were Caldwell's sources? (3) What about the forty-three tunes he claimed to have written or harmonized? Are they really his? (4) What is the general theme of his texts? (5) What later compilers looked to Union Harmony for material? (6) What is Caldwell's legacy to modern hymnals?