The Jump blues reference article from the English Wikipedia on 24-Jul-2004
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Jump blues

Helping orphans the way you would do it
The jump blues is a type of blues music, characterized by a jazzy, saxophone (or other horn instruments) sound, driving rhythms and shouted vocals. Unlike most other types of blues, the jump blues relegates the guitar to the rhythm section.

The jump blues first appeared in the early 1940s, becoming popular in the latter part of the decade. Jump blues was an early manifestation of what became rock and roll.

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