Origins and Aspects Of The Delta Blues
Juke joints in The Mississippi Delta and Beyond.
This section of an article on Wikipedia explains it nicely:
Article Source: https://en.wikipedia.org/wiki/Delta_bluesAlthough Delta blues certainly existed in some form or another at the turn of the 20th century, it was first recorded in the late 1920s, when record companies realized the potential African-American market for "race records". The major labels produced the earliest recordings, consisting mostly of one person singing and playing an instrument. Live performances, however, more commonly involved a group of musicians.
Current belief is that Freddie Spruell is the first Delta blues artist to have been recorded; his "Milk Cow Blues" was recorded in Chicago in June 1926. Record company talent scouts made some of the early recordings on field trips to the South, and some performers were invited to travel to northern cities to record. According to Dixon and Godrich (1981), Tommy Johnson and Ishmon Braceywere recorded by Victor on that company's second field trip to Memphis, in 1928. Robert Wilkins was first recorded by Victor in Memphis in 1928, and Big Joe Williams and Garfield Akers by Brunswick/Vocalion, also in Memphis, in 1929.
Son House first recorded in Grafton, Wisconsin, in 1930 for Paramount Records. Charley Patton also recorded for Paramount in Grafton, in June 1929 and May 1930. He also traveled to New York City for recording sessions in January and February 1934. Robert Johnsonrecorded his only sessions, for ARC, in San Antonio in 1936 and Dallas in 1937.
Subsequently, the early Delta blues (as well as other genres) were extensively recorded by John Lomax and his son Alan Lomax, who crisscrossed the southern United States recording music played and sung by ordinary people, helping establish the canon of genres we know today as American folk music.
Their recordings, numbering in the thousands, now reside in the Smithsonian Institution. According to Dixon and Godrich (1981) and Leadbitter and Slaven (1968), Alan Lomax and the Library of Congress researchers did not record any Delta bluesmen or women prior to 1941, when he recorded Son House and Willie Brown near Lake Cormorant, Mississippi, and Muddy Waters at Stovall, Mississippi. However, this claim has been disputed, as John and Alan Lomax had recorded Bukka White in 1939, Lead Belly in 1933 and most likely others.