that would have been shut down—that I wouldn't have felt free enough or upraised enough to write. [His] code of language was like nothing I'd heard before or since." Robert Plant"A lot of English musicians were very fired up by Robert Johnson [to] whom we all owe more or less our existence, I guess, in some way". Led Zeppelin recorded "Traveling Riverside Blues" and quoted some of Johnson's lyrics in "The Lemon Song". Keith Richards"I've never heard anybody before or since use the [blues] form and bend it so much to make it work for himself... he came out with such compelling themes [and] just the way they were treated, apart from the music and the performance, [was appealing]." The Rolling Stones recorded "Love in Vain" and "Stop Breaking Down". Johnny Winter"Robert Johnson knocked me out—he was a genius. [He and Son House] both were big influences on my acoustic slide playing." He recorded "Dust My Broom" with additional guitar by Derek Trucks. Problems of biography Until the 2019 publication of Bruce Conforth and Gayle Dean Wardlow's biography, Up Jumped the Devil: The Real Life of Robert Johnson, little of Johnson's early life was known. Two marriage licenses for Johnson have been located in county records offices. The ages given in these certificates point to different birth dates, but Conforth and Wardlow suggest that Johnson lied about his age in order to obtain a marriage license. Carrie Thompson claimed that her mother, who was also Robert's mother, remembered his birth date as May8, 1911. He was not listed among his mother's children in the 1910 census giving further credence to a 1911 birthdate. Although the 1920 census gives his age as 7, suggesting he was born in 1912 or 1913, the entry showing his attendance at Indian Creek School, in Tunica, Mississippi listed him as being 14 years old. Five significant dates from his career are documented: Monday, Thursday and Friday, November 23, 26, and 27, 1936, at a recording session in San Antonio, Texas; and Saturday and Sunday, June 19 and 20, 1937, at a recording session in Dallas. His death certificate, discovered in 1968, lists the date and location of his death. Johnson's records were admired by record collectors from the time of their first release, and efforts were made to discover his biography, with virtually no success. A relatively full account of Johnson's brief musical career emerged