Chronology of ROCK????!

Question: i really need help!!! Can anyone give me the exact or almost exact main music styles that led to rock and roll? this includes music from or influenced from different parts of the world. PS. please provide the source so i can believe u more
THANK YOU SOOOO MUCH!!!! + God Bless

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Answers: i really need help!!! Can anyone give me the exact or almost exact main music styles that led to rock and roll? this includes music from or influenced from different parts of the world. PS. please provide the source so i can believe u more
THANK YOU SOOOO MUCH!!!! + God Bless

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This might help :
http://en.wikipedia.org/wiki/Rock_music

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The Blues Man.

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