They were white musicians who were heavily influenced by jazz. Jazz quickly crossed racial lines and became popular throughout America.
Leon Bismark "Bix" Beiderbecke was an American jazz cornetist, pianist, and composer; one of the most influential jazz soloists of the 1920s.
Cole Albert Porter was an American composer and songwriter. He was born to a wealthy family in Indiana, he defied his grandfather's wishes and took up music as a profession.
George Gershwin was an American composer and pianist whose compositions encompassed both popular and classical genres.