Gayle Dean Wardlow, "Rev. D. C. Rice - Gospel singer", in Storyville 23, June–July 1969.
He is particularly associated with research into the lives of musicians Charlie Patton and Robert Johnson and the historical development of the Delta blues, on which he is a leading world authority.
In the 1960s, Speir was extensively interviewed by blues scholar Gayle Dean Wardlow about the recordings he had made.
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