 This music was to go on to become his most popular work; it is said to have been performed some five thousand times in English-speaking countries by 1930.Kelley's best-known composition was an oratorio, "The Pilgrim's Progress", composed on a text by Elizabeth Hodgkinson and based on the eponymous text by John Bunyan.It was first performed in Cincinnati in 1918, and was frequently revived thereafter, both in the United States and in England.