http://en.wikipedia.org/wiki/Blues
Before World War II, the boundaries between blues and jazz were less clear. Usually jazz had harmonic structures stemming from brass bands, whereas blues had blues forms such as the 12-bar blues. However, the jump blues of the 1940s mixed both styles. After WWII, blues had a substantial influence on jazz. Bebop classics, such as Charlie Parker's "Now's the Time", used the blues form with the pentatonic scale and blue notes. Bebop marked a major shift in the role of jazz, from a popular style of music for dancing, to a "high-art," less-accessible, cerebral "musician's music". The audience for both blues and jazz split, and the border between blues and jazz became more defined.
http://www.jazzinamerica.org/pdf/1/Influence%20of%20Jazz%20on%20Blues.pdf
The Influence of the Blues on Jazz
The blues and jazz have much in common, from their origins in the African-American communities of the southern United States at the beginning of the 20th century to their spread, through the then-developing media of sound recordings and radio broadcasts, to national and international art forms. Both the blues and jazz have multiple definitions that sometimes go beyond music and speak to the processes and viewpoints that give these revered musical art forms relevance today.
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