Kapp also worked with artists on the Brunswick label; it was over the company's objection that he had Al Jolson record "Sonny Boy"; the song became a huge success for Jolson.
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Alan Lomax interview with Memphis Slim, Big Bill Broonzy and Sonny Boy Williamson on the album, Blues in the Mississippi Night, Rykodisc, 1990.
Her song Sonny Boy was transcribed into Braille for the blind during her lifetime, indicating its popularity at the time.
Sonny Boy Williamson I (1914–1948), John Lee Curtis Williamson, "The Original Sonny Boy Williamson", born in Tennessee and associated with Bluebird Records (recordings from 1937 to 1948)
He was popular enough that by the 1940s, another blues harp player, Aleck/Alex "Rice" Miller, from Mississippi, began also using the name Sonny Boy Williamson.