The score and performing material of Jesus' Blood Never Failed Me Yet published by Schott comprises everything that is sanctioned for performance or recording. The use of an obligato voice, improvised or otherwise is expressly forbidden and cannot be authorised except by the composer. The recording by the composer on Point Music, in which Tim Waits' voice is added during the later stages of the performance, is unique. His voice was used only for this specific occasion, growing out of the personal relationship between Tom Waits and the composer and does not represent in anyway a precedent for others.