Question: What nickname is this American gospel singer, for whom Thomas A. Dorsey originally wrote the 1937 song "Peace in the Valley", referred to as?
Sentence (from "Gloria Spencer"): Gloria Spencer (1937 – April 12, 1976) was an American gospel singer who was billed as the "World's Largest Gospel Singer" due to a glandular condition that caused her to weigh 625 lb .
Relevant evidence: No