Everybody knows men usually take top dog positions in history even though women have contributed at least as much and in some cases more. Jazz is one of those areas where women havenât always gotten their props but this year 2011 different organizations are paying them tribute. A woman described as a genius named Mary Lou Williams has been made the poster girl on the poster you see here for Jazz Appreciation Month, which evidently is observed in the U.S. every April same time as National Poetry Month. Since sheâs the poster girl Williams tops this list. Most of everybody after her is ranked mostly chronologically, except number 5, instead of one being better than the other. Theyâre all seriously great musicians and excellent at their musicianship.